GEOLOGY
CRYSTALLOGRAPHY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The minerals which could be scrached by finger nail will have hardness between
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3 and 4
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2 and 3
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5 and 6
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none of these
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Explanation:
Detailed explanation-1: -The Mohs Hardness Scale ranks the order of hardness of minerals and some common objects. For example, your fingernail can scratch the minerals talc and gypsum, with a hardness of 2 or lower. A copper penny can scratch calcite, gypsum, and talc.
Detailed explanation-2: -Talc: easily scratched by a fingernail.
Detailed explanation-3: -An iron nail – it can scratch apatite but not orthoclase. Glass – it can scratch fluorite. Another way to compare the hardness of materials is by doing a simple scratch test using an iron nail. (Today’s nails are made of steel, so an iron nail may need to be ordered from a science supply house.
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