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Ang sagot ay scratched.
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Mica has nonmetallic luster but not all are black there are those with pinkish color and green color depending on the mineral incorporated in it. it cannot be scratch by fingernail, a scratch can be made using a knife or other metals.

glauconite - green color

lepidotite - pink

biotite- black

phlogophite - brown

muscovite - light colored

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