__________ is considered the hardest mineral?

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Iron

Talc

Bauxite

Diamond

answer is D.

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Detailed Solution

Diamond is considered the hardest mineral.
Diamonds are at the top of Friedrich Mohs scale of the mineral hardness scale. After it, topaz, quartz, feldspar, apatite, fluorite, calcite and gypsum are in the list. These are incredibly hard as they have crystallized in its particular atomic shape. This shape results from heat and pressure on Earth at a depth of 140 to 150km.

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