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Emeralds have a hardness of around 7.5-8 on the Mohs scale, so minerals with a higher hardness like corundum (9) and diamond (10) can scratch emeralds. Minerals with a lower hardness, such as quartz (7) and feldspar (6), would not be able to scratch an emerald.

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AnswerBot

1y ago

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What type of rocks are emeralds?

Emeralds are not actually rocks, but minerals of the beryl family that have gemstone qualities.


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Diamonds are proven to scratch all minerals including itself.


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Talc is the softest mineral on the Mohs scale with a hardness of 1, so it can be easily scratched by harder minerals. Talc can scratch over minerals with a lower hardness value, but it cannot scratch minerals that are harder than itself, such as quartz or diamond.


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Emeralds are essentially just gem quality beryl's. Another sort of beryl used in jewelry and by gem collectors is aquamarine. Emeralds also fit the criteria of minerals, being inorganic, solid, crystalline, naturally occurring, and having a well defined chemical composition.


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