Mineral Pictures Index

Mineral Pictures Index If youre interested in rock collecting, you know that rocks you find in the real world rarely look like the polished specimens you see you rock shops or museums. In this index, youll find pictures of minerals like those youll most likely encounter in your expeditions. This list starts with the handful of common minerals called the rock-forming minerals, followed by the most common accessory minerals- youll find them scattered in many different rocks but seldom in large amounts. Next, youll see a set of rare or notable minerals, some of which are common in commercial rock shops. Finally, you can check out some special galleries designed to help you to identify your specimens. Rock-Forming Minerals Rock-forming minerals are among the most common (and least valuable) minerals in the world. They form the basis of igneous, metamorphic, and sedimentary rocks, and are used to classify and name rocks. Some examples include: Biotite- Black mica, common in igneous rocks. Calcite- The most common carbonate mineral, making up limestone. Dolomite- Magnesium-rich cousin to calcite. Feldspar- A group making up the most common mineral in the crust. (Feldspar Gallery) Hornblende- The most common mineral of the amphibole group. Muscovite- White mica, found in all kinds of rocks. Olivine- A green mineral found strictly in igneous rocks. Pyroxene- A group of dark minerals of igneous and metamorphic rocks. Quartz- Familiar as crystals and as noncrystalline chalcedony. (Quartz/Silica Gallery) Accessory Minerals   Accessory minerals may be included in any rock you pick up, but unlike rock-forming minerals, they are not a basic part of the rock. In other words, a rock must contain quartz, feldspar, and mica  in order to be classified as granite. If the rock also happens to contain the mineral titanite, the rock is still granite and the titanite is classified as an accessory mineral.  Accessory minerals are also not  particularly abundant, and so they may be more valuable than rock-forming minerals. Some examples include: Andalusite- Makes collectible crossed crystals. Anhydrite- What gypsum becomes deep underground. Apatite- The phosphate mineral making up teeth and bones. Aragonite- Calcites close carbonate cousin. Barite- A heavy sulfate sometimes found in roses. Bornite- Peacock ore copper mineral tarnishes a crazy blue-green. Cassiterite- Ancient and principal ore of tin. Chalcopyrite- Foremost ore of copper. Chlorite- The green mineral of many metamorphic rocks. Corundum- Natural alumina, sometimes known as sapphire and ruby. Epidote- Metamorphic mineral of a pistachio/avocado green color. Fluorite- Every rockhound has a piece of this soft, colorful mineral. Galena- A heavy, glittering mineral, principal ore of lead metal. Garnet Almandine- The true garnet-red garnet mineral. Andradite- Green crystals from central California. Grossular- A greenish garnet illustrated by a well-formed crystal. Pyrope- Wine-colored grains in a California eclogite. Spessartine- A honey-colored set of crystals from China. Uvarovite- Emerald-green crystals from Russia. Goethite- The brown oxide mineral of soils and iron ore. Graphite- The stuff of pencils has more rugged uses too. Gypsum- Shown in its prettiest form, desert roses. Halite- Also known as rock salt, this evaporite mineral sits at your table. Hematite- Iron oxide mineral of many forms including this kidney ore. Ilmenite- Black titanium ore lurks in heavy sands. Kyanite- A sky-blue mineral formed by high-pressure metamorphism. Lepidolite- Lithium mica mineral with a fine lilac color. Leucite- Feldspathoid mineral also called white garnet. Magnetite- Magnetic iron oxide also known as lodestone. Marcasite- Close crystal cousin of pyrite. Nepheline- Feldspathoid mineral well known to potters. Phlogopite- Brown mica mineral closely related to biotite. Prehnite- Bottle-green mineral of low-grade metamorphic rocks. Psilomelane- Manganese oxides make up this black crusty mineral. Pyrite- Fools gold and the most important sulfide mineral. Pyrolusite- The black manganese mineral of dendrites. Rutile- Needles of this oxide mineral occur in many rocks. Serpentine- The group of green minerals that yields asbestos. Sillimanite- Indicator mineral for high grades of metamorphism. Sphalerite- The major zinc ore and an interesting mineral. Spinel- Rugged oxide mineral of metamorphosed limestones. Staurolite- A typical crossed pair of crystals in a mica schist matrix. Talc- The softest mineral of them all. Tourmaline- The common black variety called schorl. Zeolites- Group of low-temperature minerals with many industrial uses. Zircon- Both a gemstone and a precious source of geologic information. Uncommon Minerals and Varieties This collection of minerals includes metals, ores, and gems. Some of these gold, diamond, and beryl for example are among the most valuable and coveted minerals in the world. If you find these in your rock hunting excursions, be sure to keep them safe. Some examples include: Amethyst- The purple form of crystalline quartz. Axinite- Minor silicate of striking crystal form and color. Benitoite- Very blue, very rare and weird ring silicate mineral. Beryl- Gemstone of many names, including emerald. Borax- This household commonplace is mined in desert lakebeds. Celestine- Pale, sky-blue strontium carbonate. Cerussite- Spiky gray lead carbonate. Chrysocolla- Bright green-blue mineral found near copper ore. Cinnabar- Lipstick-red mineral and major ore of mercury. Copper- Native metal shown in its natural wiry form. Cuprite- Red copper ore and sometimes spectacular specimen stone. Diamond- Natural diamond crystal from the Congo. Dioptase- Bright-green crystalline sign of copper deposits. Dumortierite- Blue boron mineral of gneisses and schists. Eudialyte- Striking red vein-maker in nepheline syenites. Fuchsite- Chromium colors this mica mineral a flashy green. Gold- The native metal shown in an Alaskan nugget. Hemimorphite- Handsome pale crusts of hydrous zinc silicate. Herkimer Diamond Quartz- Doubly terminated crystals from New York. Labradorite- The butterfly of the feldspars has dazzling blue schiller. Lazurite- Ancient mineral source of ultramarine pigment. Magnesite- Magnesium carbonate ore mineral. Malachite- Ultra-green copper carbonate, a favorite mineral of carvers. Molybdenite- Soft metallic mineral and ore of molybdenum. Opal- Precious silica mineraloid may display a rainbow of colors. Platinum- Rare crystalline nuggets of the native metal. Pyromorphite- Flashy green lead phosphate mineral. Pyrophyllite- Soft mineral closely resembling talc. Rhodochrosite- Calcites manganese cousin with distinctive rosy color. Ruby- Deep-red gemmy variety of corundum. Scapolite- Streaked clear crystals of metamorphosed limestones. Siderite- Brown iron carbonate mineral. Silver- Wiry specimen of the rare native metal. Smithsonite- Carbonate of zinc appears in many forms. Sodalite- Deep blue feldspathoid and a rock carvers staple. Sulfur- Delicate crystals accumulate around a volcanic vent. Sylvite- Red potassium mineral distinguished by its bitter taste. Titanite- Collectible brown crystalline mineral once known as sphene. Topaz- Hardness and good crystals make it a popular mineral. Turquoise- The most precious phosphate mineral. Ulexite- One of many borate minerals, ulexite forms the unique TV rock. Variscite- This phosphate comes in veins like slabs of green candy. Willemite- Prized by collectors for its bright fluorescence. Witherite- Scarce barium carbonate mineral. Tools for Identifying Minerals It isnt always easy to identify minerals, even if theyre fairly common. Fortunately, there are tools used by geologists to aid in identification. Special tests for luster and streak can help; so too can these galleries of relatively common minerals of different colors. Black Minerals Blue and Purple Minerals Brown Minerals Green Minerals Red and Pink Minerals Yellow Minerals Mineral Habits Mineral Lusters Mineral Streak Mineraloids

How to Calculate PSAT Score 3-Step Score Calculator

How to Calculate PSAT Score 3-Step Score Calculator SAT / ACT Prep Online Guides and Tips If you’re struggling to calculate your PSAT score, then it sounds like you’re in need of a handy PSAT score calculator! In this guide, we offeryou step-by-step instructions on how to calculate PSAT scores. To begin, we'll look at how the PSAT is scored and what â€Å"equating† means. We'll then go overhow to calculate various PSAT scores before finishing with an explanation on how a PSAT score calculatorcan help you get the PSAT score you want. How Is the PSAT Scored? The PSAT is scored on a scale of 320-1520 in 10-point increments. Your total PSAT scoreis the sum of your Math and Evidence-Based Reading and Writing (EBRW) section scores. (EBRW is a combination of your Reading and Writing and Language scores). These two sections areeach scored on ascale of 160-760, which is equivalent to half the total score range. But there aren't 1,520 questions on the PSAT, sowhere do these numbers come from? In reality,your Math and EBRW scores start outas raw scores. A raw score is simply the number of questions you answered correctly. So if I were to get 40 Reading questions right, my raw Reading score would be 40. (Note that the PSAT uses rights-only scoring, so you'll never lose any points for incorrect answers.) Next, your raw scores for Math, Reading, and Writing and Language (we'll refer to this section as"Writing" from now on) are converted into finalscaled scores using a special equating process. The College Board (the creators of the PSAT) uses equating toaccount for slight differences in difficulty among tests, making it so thatascaled PSAT score always indicates the same level of ability, regardless of test. Here’s how the College Boarddescribes the equating process used for the PSAT: â€Å"This conversion process adjusts for slight differences in difficulty among versions of the test and provides a score that is equated, or consistent, across forms. This process ensures that no student receives an advantage or disadvantage from taking a particular form of the test on a particular day;* a score of 400 on one test form is equivalent to a score of 400 on another test form.† *Emphasis mine. Ultimately, what this means isthat raw scores will not alwaysconvert into the same scaled scores on different PSATs. Here's an example to illustrate this concept:on this practice PSAT, you can see that a 23 raw Math score converts into 540, but on this practice PSAT,23 converts into 510 instead. So are raw scores and scaled scores the only scores you'll get on the PSAT? Not at all!In addition, you’ll receivesubscores and cross-test scores (the same as those on the SAT) as well as aNational Merit Selection Index score. Subscores measure specific skills in each section on ascale of 1-15, whilecross-test scoresmeasureyour understanding ofhistory/social studies and science questions on a scale of8-38. The Selection Indexis perhaps one of the most unique scores you'll get; it has a score range of 48-228 and is used to determine your eligibility for the National Merit Scholarship Program. To qualify for the program, you must earn a Selection Index score at or above your state’scutoff score. Now, let'scalculate PSAT score areas together! Are raw PSAT scores as tasty as raw cookie dough? How to Calculate PSAT Score: Raw Scaled Here, we'llshow you how to calculate yourraw and scaled (section) PSAT scores. If you'd like to calculateyour own scores as you read along, make sure you have access to the answer key for whichever official PSAT practice testyou took. This will act as your PSAT score calculator. Note that all of the example charts and conversions below are based onthescoring guidetoPSAT Practice Test #1. Step 1: Determine Raw Scores Raw scores are a relatively easy-to-calculate PSAT score area. Remember,raw scores equal the number of correct answers you got.In other words,the highest raw score you can earn on a section will be the same as the total number of questions in that section. Each of the three PSAT sections - Reading, Writing, and Math - contains a different total number of questions, or a different raw score range. Math is the only section that's actually divided into two subsections, No Calculator and Calculator, each of which has its own raw score range. Here is an overview of the raw score ranges on the PSAT: PSAT Section Reading Writing and Language Math No Calculator Calculator Raw Score Range 0-47 0-44 0-17 0-31 Raw Reading Score Your raw Reading score will be out of 47 points. Using your practice test’s answer key, add up all of the correct answers you earned on the Reading section to get your raw Reading score. For example, if I were to miss 13 questions on the Reading section, my raw Reading score would be 34: Raw Writing and Language Score Your raw Writing score will be out of 44 points. The Writing answer key is located next to the Readinganswer key. Once again, add up all of your correct answers on your test's answer key to getyour raw Writing score. Here's an example: Raw Math Score As I mentioned above, Math is divided into two subsections: No Calculator and Calculator. This means you’ll receive two raw Math scores that'llbe subsequentlycombined to give you a total raw Math score. The maximum number of points you can earn is17 on Math No Calculator and 31 on Math Calculator. Altogether, then, you can earn up to 48 points on Math. To calculate your raw Math score, tally your correct answers on the No Calculator and Calculator subsections. Soif I were to miss 5 points on No Calculator and 8 on Calculator, my raw Math scores would be 12 and 23, respectively: Then, combine these two scores to get your total raw Math score: Step 2: Convert to Scaled Scores Scaled, or equated, scores are the final section scores you'll receive on the PSAT. These scores use a scale of 160-760, with each accounting for half your total PSAT score. As we discussedpreviously, raw-score-to-scaled-score conversions vary slightly with each PSATdue to differences in equating formulas. Thus, theconversion charts we use for our examples below will not apply exactly to all PSATs. (Remember, our examples are all based on a specific test - PSAT Practice Test #1!) Now, let's take a look at how to calculate your scaled PSAT scores. Math Section Score Start by calculatingyour total raw Math score using the steps above. Thisscore will be out of48 points. Next, look for the "Raw Score" and "Math Section Score" columns on your practice test’s raw score conversion table. (As a reminder, conversion tables varyslightly with eachtest, so one raw Math score on one test may not convert into the same scaled Math score on another test.) On the chart, your raw Math score will directly convert into a Math section score (i.e., a scaled score). To convert your score, simply match your raw score with the corresponding Math section score. In my example above, mytotal raw Math score was 35, whichconverts into 650: Raw Score Math Section Score Raw Score Math Section Score 0 160 25 560 1 190 26 570 2 210 27 580 3 240 28 580 4 270 29 590 5 290 30 600 6 320 31 610 7 340 32 620 8 360 33 630 9 370 34 640 10 390 35 650 400 36 670 12 420 37 680 13 430 38 690 14 440 39 710 15 460 40 720 16 470 41 730 17 480 42 730 18 490 43 740 19 500 44 740 20 510 45 750 21 520 46 750 22 530 47 760 23 540 48 760 24 550 EBRW Section Score Calculating your EBRW section score requires a couple of extra steps. Like the process you followedfor figuring outyour Math section score, beginby calculating your raw Reading and Writing scores (using the steps above). These scores will be out of 47 and 44 points, respectively. Next, look for your scaled Reading and Writingscores using your practice test’s raw score conversion table. Find your raw scores for each section and then look across to the corresponding column to determineyour Reading and Writing test scores. These test scores, though scaled, are not your final section scores.Unlike PSATsectionscores, which use a score range of 160-760, test scores use a much smaller rangeof 8-38. Myraw Reading score above was 34, and my raw Writing score was 38. According to the following conversion table, these two raw scores convert into scaled (test) scores of30 and 33, respectively: Raw Score Reading Test score Writing and Language Test Score Raw Score Reading Test Score Writing and Language Test Score 0 8 8 24 25 25 1 9 9 25 26 25 2 10 10 26 26 26 3 27 27 27 4 12 12 28 27 27 5 14 13 29 28 28 6 15 14 30 28 28 7 16 14 31 29 29 8 16 15 32 29 29 9 17 15 33 30 30 10 18 16 34 30 30 18 16 35 31 31 12 19 17 36 31 32 13 19 18 37 32 32 14 20 18 38 32 33 15 20 19 39 33 34 16 21 20 40 34 35 17 21 20 41 34 36 18 22 21 42 35 37 19 22 21 43 36 37 20 23 22 44 37 38 21 23 23 45 37 22 24 24 46 38 23 24 24 47 38 Step 3: Combine for Total Score Once you have your individual Reading and Writing test scores, combine these scores to get a total EBRW test score on a scale of 16-76. Finally,multiply this sum by 10 to get your scaled EBRW score. As an equation, this conversion process can be writtenas so:(R+W)10=EBRW. In my example above, my Reading and Writing test scores were 30 and 33, respectively. Using this equation, then, here's what my EBRW score comes out to: (30+33)10=(63)10=630. Now,add your EBRW section score to your Math section score to getyour total PSAT score out of 1520. Inmy example, my total PSAT score would be650+630=1280. How to Calculate PSAT Subscores and Cross-Test Scores In addition to calculating your raw and scaled scores, you have the option ofcalculating your subscores and cross-test scores. These additional scores offer a closer, more detailed analysis of your performance on particularcontent areas and question types on the PSAT. Read on to learn how to calculate PSAT subscores and cross-test scores. Subscores To calculate your subscores, start by finding your raw scores for each of the following subscore categories: Math Heart of Algebra Problem Solving and Data Analysis Passport to Advanced Math EBRW Expression of Ideas Standard English Conventions Words in Context Command of Evidence Add up your correct answers on Math and EBRW using their respective answer keys. Then,use your scoring guide to see which questions on your test make up whichsubscore categories. Here is an example of a subscore overview for the EBRW subscore Expression of Ideas: Once you’ve got your seven raw subscores, use your test’s raw score conversion table for subscores to convert your raw subscores into scaled subscores. All scaled subscores use a scale of1-15. So forexample, if I were to get a raw score of 17 on Expression of Ideas, my scaled subscore would be12: Unfortunately, you're not allowed to have a lab partner on science questions. Cross-Test Scores You’ll also receive two cross-test scores: Analysis in History/Social Studies Analysis in Science Unlike subscores, cross-test scores are notconfined to a single section on the PSAT. This means that you can find a combination of Analysis in History/Social Studies and Analysis in Science questions in both the EBRW and Math sections. Each cross-test score begins as a raw score. To find your raw cross-test scores, use your scoring guide to determine which EBRW and Math questions make upwhich cross-test categories. Below is an example of a cross-test score overview for the Analysis in Science score: Once you have your raw scores for both cross-test scores, use your test’s raw score conversion table for cross-test scores to figure out your scaled cross-test scores for History/Social Studies and Science. Scaled cross-test scores use a scale of 8-38 (note that this is different from the 1-15 scoring scale used for subscores). Soif I were to receive a raw score of 19 on Analysis in Science, my scaled cross-test score for that area would equal 29: How to Calculate National Merit Selection Index Finally, there’s the National Merit Selection Index score. Unlike the other scores we’ve covered so far, you won’t find any conversion table for your Selection Index ona PSAT practice test. So how can you calculate this score? Here are the steps to take: 1. Find your Reading and Writing test scores. To find these scores, calculate your raw scores for Reading and Writing and then use your raw score conversion table to convert your raw scoresinto scaled testscores (on a scale of 8-38). 2. Find your Math test score. Unlike your Reading and Writing scores, your Math test score isn’t on a conversion chart. So how do you find this score? First,get your Math section score by matching your raw Math score to its corresponding scaled score on your conversion table. Then, to get your Math test score, simply divide your Math section score by 20. So ifmy scaled Math score were 680, my Math test score would be 680/20=34. 3. Add your test scores together. Next, combine your Reading, Writing, and Math test scores. This will give you a total PSAT test score on a scale of 24-4. 4. Multiply your total test score by 2. Finally, take your total PSAT test score and multiply it by 2 to get your Selection Index. Once again, the Selection Index score range is 48-228. In the end, if you’re aiming for a scholarship, you’ll need to have a Selection Index high enough to qualify you for National Merit in your particular state. These cutoff Selection Index scores range anywhere from 209-222. For more information about the Selection Index scores needed to qualify, check out our guide on how to become a National Merit Semifinalist. Want to improve your PSAT score by 150 points? We have the industry's leading PSAT prep program. Built by Harvard grads and SAT full scorers, the program learns your strengths and weaknesses through advanced statistics, then customizes your prep program to you so that you get the most effective prep possible. Check out our 5-day free trial today: Next up, we'll decipher the meaning of PSAT score calculations. What Do PSAT Score Calculations Mean for YOU? So far we’ve explained how to calculate various PSAT scores, from raw and scaled scores to subscores, cross-test scores, and Selection Index scores. But what do all of these calculations mean for you? Using conversion tables as a PSAT score calculator allows you to forma rough idea as to how many questions you’ll need to answer correctly in order to attain a certain scaled PSAT score. Essentially,if you have aPSAT goal scorein mind, you can use raw score conversion tables from official PSAT practice tests to estimate how many correct answers you’ll need to be able to hit your goal score on test day. For example, let’s say your total PSAT goal score is 1300, or 640 on Math and 660 on EBRW. To get 640 on Math, you’ll need to scorearound 34-38 raw points, or get 34-38 questions right. (We calculated this estimated raw score range using the official conversion tables for PSAT Practice Test #1 and #2.) Figuring out the number of questions you'll need to get right for EBRW, however, requires you to do more than just look at a conversion table. You'll first need to divide your EBRW goal score (in this case, 660) by 10 to get your EBRW test score. Then, divide this score by 2 to get your estimated test scores for the Reading and Writing sections. Finally, use official conversion tables to get a corresponding raw scorefor each of these two test scores. In my example, a 660 EBRW goal score equals about 38-39raw points for Reading and 37-38 raw pointsfor Writing. Of course, these raw score ranges are all simply estimates. Because the College Board doesn’t tell us ahead of time how raw scores for upcoming PSATs will be equated, there’s no way to know for sure how many questionsyou’ll need to answer correctly in order to hityour goal scores. Still, you can get a pretty close approximation using official conversion tables! Recap: How to Calculate PSAT Score The PSAT is scored on a scale of 320-1520 in 10-point increments. This total score consists of two section scores for Math and EBRW, each of which uses a scale of 160-760. You’ll also getsubscores on a scale of 1-15 and cross-test scores on a scale of 8-38. Lastly, you’ll get a Selection Index score on a scale of 48-228; this score's sole purpose is todetermine your eligibility for National Merit. All of these PSAT scores are scaled, or equated, scores. Your PSAT scores will start out as raw scores based on the number of questions you answered correctly. Yourraw scores are then converted into scaled scores using a special equating process exclusive to yourtest. To convert your raw scores into scaled scores (or even vice versa), useraw score conversion tables for official PSAT practice tests. Though these tables apply to specific practice tests only, you can use them as a convenient PSAT score calculator toestimate the number of questions you’ll need to answer correctly in order to hit your goal scores on test day. What’s Next? Want to learn more about PSAT scoring and the PSAT score range? Our in-depth guides explainhow the PSAT score range differs from the SAT score range as well as how you can use the PSAT scoring system to your advantage. Are you aiming for National Merit?Get the rundown on how to win a scholarship and what you can do to guarantee yourself a perfect PSAT score! Want to improve your SAT score by 160 points or your ACT score by 4 points?We've written a guide for each test about the top 5 strategies you must be using to have a shot at improving your score. Download it for free now: