7. You go hiking and find an unknown mineral. You perform some basic tests of th

Question

7. You go hiking and find an unknown mineral. You perform some basic tests of the mineral's physical properties. Analyzing your data below, what mineral did you find? Color: Clear Luster: Glassy Cleavage: None Fracture: Irregular shape Streak: None, does not scratch streak plate (Porcelain streak plate has Hardness of~7.0) Hardness: Mineral scratches a Steel file, but was scratched by Topaz and could not scratch Topaz itself. A. Mica B. Quartz C. Calcite D. Diamond 8. What is the source of the energy that powers the Earth system? A. the Sun B, heat from Earth's interior C. both answer A and B D, none of the above 9. You were out wandering around the corn fields and you happen upon a glassy-appearing mineral. It looked like a diamond and you sure hope it is! What is the most reliable and'simple' test could you perform that might help you make a determination? perform the streak test. If it leaves a powder streak markI know it is a diamond! the color is all you need. It is clear, so it must be a diamond! - look at the luster. It is glassy and therefore it must be a diamond! perform the hardness test by scratching against several other objects and comparing to Mohs hardness scale. If it scratches everything and it cannot be scratched it is a diamond! 10. Geologists classify minerals according to their chemical elements. Silicates contain Sulfides contain sulfur. and Carbonates contain and oxygen 11. The Earth consists of systems and in a sense the Earth as a whole can be considered a system. Open, closed and isolated systems are driven by the flow and exchange (or non-exchange) of 12. As the rate of cooling decreases [slows down), the size of mineral crystals that form_ A. Increases B. Decreases C. Remains the same D. wiggles around in circles

Explanation / Answer

7. Answer: Mica Explanation: The material found does not scratch streak plate, it means that quartz and diamond cannot be the material because quartz and diamond have a hardness value of 10 which can scratch the streak plate as its hardness value is ~7. Mica has colorless streak and calcite has white streak. Mica also has a vitreous luster that is glassy luster. 8. Answer: C Both answer A and B. Explanation: Both of the energy sources accounts for the earth's system. Sun provides most of the energy and the energy from the interior is responsible for geological events like formation of mountians, volcanoes etc. 9. Answer: Perform the hardness test by scratching against several other objects and comparing to Mohr's hardness scale. If it scratches everything and it cannot be scratched then it is a diamond. Explanation: This is a handy experiment which can be done at site as the other materials of hardenss value can be obtained and can be checked. The other properties are similar to other minerals as well. 10.Answer: Silicon, carbon. Explanation: Carbonate in the sense, the presence of carbonate ion in the carbonate minerals, like aragonite , magnesite. Where the hydrogen will not be present.

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