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- the tendency of a mineral to break along flat surfaces.


- a solid substance in which the atoms are arranged in an orderly, repeating, three-dimensional pattern.


- the amount of matter in a given space.


- a substance that contains only one type of atom.


- the tendency of a mineral to break along curved or irregular surfaces.


- the resistance of a mineral to being scratched.


- the way the surface of a mineral reflects light.


- a substance that forms in nature, has a definite chemical makeup, and has a crystal structure.


- the color of powder left behind when a mineral is scraped across a surface.

Streak Plate

- a tile of unglazed porcelain, used as a tool by geologists to identify minerals by their streak.

Mohs Scale

- the scale used to measure hardness

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