SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Talc
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Quartz
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Diamond
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Feldspar
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Detailed explanation-1: -Diamond is the hardest known mineral. It is a high-symmetry allotrope of carbon (C). It has a Mohs “scratch” hardness of 10, which makes it the hardest mineral.
Detailed explanation-2: -Mohs Hardness Scale Diamond is the hardest mineral; no other mineral can scratch a diamond. Quartz is a 7. It can be scratched by topaz, corundum, and diamond. Quartz will scratch minerals that have a lower number on the scale.
Detailed explanation-3: -Diamonds are known for being one of the hardest substances on earth. A diamond is so hard it ranks as a 10 on the Mohs scale–the highest level of hardness.
Detailed explanation-4: -Although diamond was the hardest material Mohs put on the scale, there are six materials that are now known to be harder, like wurtzite boron nitride or a pure lonsdaleite meteorite, but the other four are not naturally occurring.
Detailed explanation-5: -As the hardest known naturally occurring substance when the scale was designed, diamonds are at the top of the scale.