Minerals are natural(not man-made), homogenous substances found in the Earth's crust.
Minerals make up rocks.
Minerals can be identified by several tests that look at physical and chemical properties.
These tests include:
Colour,
Hardness,
Luster(shine),
Effervescence(gives off a gas when acid is put on it),
Magnetism and
Streak colour.
"CHLEMS"
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