Microcline can accommodate only a little sodium and, like orthoclase, may occur with albite. Potassium Feldspar family: Orthoclase and Microcline KAlSi3O8 6 2.5-2.6 White Pink. Multiple Answers: Hematite, Potassium Feldspar, Plagioclase Feldspar, Some Magnetite, some Pyroxene What two properties are most useful in distinguishing calcite and halite ? A diamond can only be scratched by another diamond. If Specimen A does not scratch Specimen B, then Specimen B is harder than Specimen A. Which of the following minerals will scratch quartz? - 6207295 ChristineDolfo ChristineDolfo 03.11.2020 Science Junior High School answered What minerals can be scratched by feldspar?? This is because feldspar is a 6 on the scale and quartz is a 7. Based on the table above, what mineral did she most likely find? Talc. - 6207295 ChristineDolfo ChristineDolfo 03.11.2020 Science Junior High School answered What minerals can be scratched by feldspar?? The igneous rock is comprised of mostly quartz and feldspar, along with smaller amounts of various other minerals. To figure out the hardness of a mineral, try to scratch it with an object of known hardness. Calcite: Calcite can be scratched with a copper coin. Can talc scratch quartz? What are the two types of feldspar? 2 cleavages at 90°. Even the graphite in a pencil is a mineral. 30 seconds. According to the scale, Talc is the softest: it can be scratched by all other materials. Q. The process by which atoms are arranged to form a material with a crystal structure. If diamond is the hardest mineral does that mean it can scratch the other minerals on the MOHs hardness scale. Mohs hardness scale was devised in 1812 by Friedrich Mohs and has been the same ever since, making it the oldest standard scale in geology.It is also perhaps the most useful single test for identifying and describing minerals.You use the Mohs hardness scale by testing an unknown mineral against one of the standard minerals. What are the 4th and 5th hardest. Alkali feldspars occur in many rocks. You can also test calcite and marble with glass: glass has a hardness between 4 and 7, which means it will also scratch both calcite and marble but not either feldspar nor quartz. Talc, however, will not scratch gypsum. Answer (1 of 3): For minerals, âhardnessâ is a specific form of resistance to deformation: scratch hardness. Gypsum is harder: it can scratch talc but not calcite, which is even harder. Polymorphism & Series: Dimorphous with orthoclase. ⦠Feldspar _____. Feldspar forms when magma solidifies into igneous rocks. In this way, can gypsum scratch quartz? He selected ten standard minerals, and arranged them in order of increasing hardness. As you can see, diamond is a 10 on the Mohs Hardness Scale. Talc Which mineral is most easily scratched? There is no mineral that would satisfy the question. It can be scratched by topaz, corundum, and diamond. A mix of light and dark but with no quartz. Does it make a mark? The metal in a fork has minerals. This sample scratches the mineral apatite readily but can't scratch microcline (feldspar). It is slightly harder than glass as a mineral, but not hard enough to make big gouging scratches like a diamond would produce, for example. Fluorite is oneâ¦.Mohs Hardness Scale.HardnessMineral3Calcite4Fluorite5Apatite6Orthoclase feldspar6 more rows What object can scratch feldspar but not quartz? Quartz will scratch minerals that have a lower number on the scale. Mohs' scale of mineral hardness is named after Friedrich Mohs, a mineralogist.Mohs scale is ordered by hardness, determined by which minerals can scratch other minerals.. I think the long black minerals with cleavages are amphibole and the round green ones are olivine. What number on the A. talc B. gypsum C. calcite D. feldspar. Orthoclase feldspar: Feldspar scratches a knife blade or window glass. HARDNESS REPRESENTATIVE MINERAL 6 Feldspar, e.g., KAlSi 3 O 8 5 Apatite, Ca 5 (PO 4 ) 3 (OH,F) 4 Fluorite, CaF 2 3 Calcite, CaCO 3. It is slightly harder than glass as a mineral, but not hard enough to make big gouging scratches like a diamond would produce, for example. Talc, Gypsum, Topaz. One last test that is commonly used is called a streak test. Can be scratched with a knife and any stone rated 6+. What has a hardness of 6? Answer and Explanation: Objects that can scratch feldspar but not quartz would be those rated as a 7 on the Mohs hardness scale. Translucent to opaque. Rottenstone, whiting, pumice, volcanic ash, quartz, marble, feldspar, and silica are prime examples of an abrasive. Quartz (#7) can scratch all minerals numbered 1-6 (feldspar and calcite, for example). 6 orthoclase (a common form of potassium feldspar) 7 quartz 8 topaz 9 corundum 10 diamond. Which mineral is hard enough to scratch calcite? Gypsum is harder: it can scratch talc but not calcite, which is even harder. Thus, a copper penny can scratch calcite, gypsum and talc, while a fingernail can scratch only gypsum and talc. Figure 2.17 shows an alternative way to make a cumulative plot. 5. Apatite (5): about the same hardness as teeth and can be scratched with glass or a steel knife blade. What object can scratch feldspar but not quartz? Note the magnet! Will scratch any stone rated 5-. Feldspar has a Mohs hardness of 6. A diamond is much harder than corundum, even though theyâre only one division apart on the scale. This is because feldspar is a 6 on the scale, and quartz is a 7. 4- Finally, you want to confirm your decision with other observations. GABBRO: Can see crystals â lots of Click to see full answer. Name 2 objects that will scratch fluorite piece of copper or fingernail 6. Answer (1 of 4): depends on the glass type, but most metals, sand, rocks.. if it is your glasses, tissue paper, t-shirts, lense cleaning rags, apparently even your eyelashes⦠If your looking to artistically scratch glass Iâd go for a diamond edged file ⦠»More detailed A mineral's "streak," or color when it is finely powdered, is always the same, even when the color of the mineral varies. Colorless to white. 45 seconds . Now use the coin to see if you can scratch each mineral. Will scratch any stone rated 4-6: Feldspar Pyrite Amazonite Hematite: Can be scratched with a knife and any stone rated 7+. Feldspar: Feldspar is primarily made up of flint and aluminum silicate. Bon Ami 1886 Original Formula Cleaning Powder is the original, âclassicâ formulation of feldspar and tallow soap. If quartz is harder than most minerals such as feldspar, then it can easily scratch it. Try scratching it with the nail. Gypsum : 3. The rock can scratch glass. If a mineral is able to scratch feldspar. Diamond is the hardest mineral; no other mineral can scratch a diamond. An extrusive igneous rock with a mineral composition of 35% quartz, 35% potassium feldspar, 15% plagioclase feldspar, 10% biotite, and 5% amphibole is called. It is found it all of the three rock types, but is most common in intrusive igneous rocks like granite where the crystals look white or pink. The steel file is able to scratch minerals with hardness of 6.5 down to 1, and does not give you any precise information. If it does, itâs higher than 6.5. Is ⦠These may be divided into two types of feldspar: plagioclase and alkali.Feldspars which are in this grouping include: Microcline. Its specific gravity is about 23 times greater than halite's. Look at the scale below - click on the pictures to find out about each mineral. 3. can the student accurately make? If it gets scratched, itâs under 5.5 on the scale. Your email address will not be published. Tags: Question 24 . topaz, but cannot scratch fluorite. Feldspar. Hardness Mineral 5 Apatite 6 Orthoclase feldspar 7 Quartz 8 Topaz. Lustre - Vitreous. What is the 6th mineral on the MOHs hardness scale. The feldspar-group, a very complex mixture of oxygen, silicon, aluminum and trace elements like sodium, potassium, calcium and more exotic elements like barium, are by far the most common minerals, making up almost 58% of all to a geologist accessible rocks, especially magmatic and metamorphic ones. Polymorphism & Series: Dimorphous with orthoclase. Examples of minerals are feldspar, quartz, mica, halite, calcite, and amphibole. Quartz will scratch minerals that have a lower number on the scale. Feldspar crystals can be white, black, and any shade of grey. a naturally occurring solid that that has a crystal structure, a fixed chemical composition, and is form by an inorganic process. Science; Earth Sciences; Earth Sciences questions and answers; Which mineral will scratch fluorite but not feldspar? Hematite can scratch glass but not a steel file. Specific gravity - 2.6. 6 Feldspar [Example: A steel file will scratch it] 5 Apatite. Quartz is a 7. Feldspar is hard to scratch and fairly hard to dissolve, and it will break if hit with a hammer. Hardness 2.5. Apatite, and Talc. If a mineral is scratched by Topaz(8) but not by Quartz(7), and it can scratch Quartz, what is its hardness rating? black; can have iridescent play of color from within. Soft - can be scratched by a fingernail, Mohs' 1-2; Medium - can be scratched by a knife or nail, Mohs' 3-5; Hard - cannot be scratched by a knife but can scratch glass, Mohs' 6-9; A relative hardness value of 6.5 means that the mineral could scratch orthoclase (feldspar) but not quartz. A true scratch leaves a permanent mark on the object you are trying to scratch. Hardness 1 2. This is because feldspar is a 6 on the scale, and quartz is a 7. According to the scale, Talc is the softest: it can be scratched by all other materials. Twinning. For example, the common mineral quartz has a hardness of 7, so any mineral that you can scratch with a quartz crystal has a hardness of less than 7. ... soft pencil lead will scratch talc. Feldspar. It can be scratched by topaz, corundum, and diamond. Sometimes might have 3 Cleavages Vitreous to pearly luster. feldspar apatite topaz fluorite 2 See answers hlas2001 hlas2001 apatite, topaz, and fluorite will all scratch quartz. A thorough knowledge of the feldspars is what separates geologists from the rest of us. Feldspars are hard minerals, all of them with a hardness of 6 on the Mohs scale. This lies between the hardness of a steel knife (5.5) and the hardness of quartz (7). In fact, feldspar is the standard for hardness 6 in the Mohs scale. Quartz is a 7. What is the softest mineral on the earth? What is the answer of "this mineral found by Cherryl could be scratched by feldspar but not by apatite."? Results. Salt & pepper appearance. Answer & Explanation: Objects that can scratch feldspar, but not quartz, get a 7 on the Mohs hardness scale. Sample 2. Diamonds (#10) can scratch anything. Any type of feldspar or quartz . Quartz can scratch feldspar but not scratch quartz. Quartz can 't scratch quartz because. Will the mineral topaz scratch quartz or will quartz scratch topaz Why? This sample can't be scratched with an ordinary fingernail, but the mineral calcite is able to impart a noticeable scratch on its surface. Could it be it ? Alkali feldspars occur in many rocks. Quick Answer: Can Feldspar Scratch Glass. Potassium feldspar (or alkali feldspar or K-spar) is a member of the feldspar mineral family and is a silicate mineral. A good brand, such as Feldspar porcelain oven safe bowls, is worth the investment. More than 60% of the earthâs crust consists of Feldspars. In 1812, a man named Fredrich Mohs invented a scale of hardness called Mohs Scale which is still used today. If so, itâs under 3.5 on the hardness scale. Report an issue. Minerals of the same hardness wonâ t scratch each other. SURVEY . 10. This is not a linear scale, that is, Changes can be utilized to lower the temperature at which liquid glass is produced, typically around 1000 to 1300oC. Orthoclase 7. In this article, weâll talk about feldspar (background and characteristics), so you can learn about this versatile stone. Usually we see feldspar as the opaque bits of granite, as the opaque grains in sand, or as the dull and orange-y bits in sandstone. It is found in granite pegmatites and in metamorphic rocks, such as gneisses and schists. each one. Mineral Group: Feldspar (alkali) group; (Si,Al) is completely ordered in low microcline. If the two specimens are equal in hardness then they will ⦠Quartz will scratch minerals that have a lower number on the scale. Quartz and Feldspar are minerals that we can find prominently in the earthâs crust. It contains a considerable amount of potassium and is typically pink-salmon to white in color. Diamond is the hardest mineral; no other mineral can scratch a diamond. 1.875 / 3 points What are three minerals in this lab that can scratch glass? Q. can be scratched with a penny white or colorless glassy, but may not be shiny Feldspar can scratch glass white, gray, or cream shiny and glassy or pearly Kelly found a mineral that is colorless, has a glassy luster, and can scratch glass. 7.5. A rough measure of mineral hardness can be made by assembling a kit of handy objects (table 6). Quartz will scratch minerals that have a lower number on the scale. Glass can be scratched by any mineral harder than ~5.5. What object can scratch feldspar but not quartz? Scratch hardness is just like it sounds: resistance to scratching. For instance, if a fingernail cannot scratch a mystery mineral, we know it has a hardness of more than 2.5. 500. A fingernail scratches gypsum. 27% of students gave this response. Glass is assigned a Mohs hardness number of 5.5 because it will scratch apatite (Mohs' hardness number = 5) but will not scratch orthoclase feldspar (Mohs' hardness number = 6). 1)Calcite 2) Pyroxene 3) Potassium Feldspar 4) Garnet 27.Which mineral bubbles when acid is placed on it? They physically scratch off dirt, stains, and tarnish via friction as you rub a surface. Corundum and Diamond. Any mineral with roughly a hardness of 6 or more on the Mohs scale of mineral hardness could scratch glass, which is ⦠Some minerals that could scratch glass would be quartz, topaz, corundum, and diamond. ⦠Any type of feldspar or quartz . 1) garnet 2) pyroxene 3) plagioclase feldspar 4)selenite gypsum In fact, you can scratch a glass mason jar or plate with both feldspar and quartz! What are the types and uses of cleaning agents? The clay minerals form during mineral weathering. Science; Earth Sciences; Earth Sciences questions and answers; Which mineral will scratch fluorite but not feldspar? The most common are quartz, feldspar, mica, and calcite. Quartz is a 7. Fluorite , Apatite. A diamond is the hardest mineral. For example quartz will make a scratch on the plate, and its hardness has been recorded at 7. Fluorite 5. Click to see full answer. What mineral will scratch glass but not a streak plate? Corundum and Diamond. Translucent to opaque. Chemical composition - KAlSi 3 O 8. Rocks are made up of one or more minerals. Answer and Explanation: Objects that can scratch feldspar but not quartz would be those rated as a 7 on the Mohs hardness scale.
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