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11 terms

Sci. 6 Ch.2 Vocabulary

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Cleavage
- the tendency of a mineral to break along flat surfaces.
Crystal
- a solid substance in which the atoms are arranged in an orderly, repeating, three-dimensional pattern.
Density
- the amount of matter in a given space.
Element
- a substance that contains only one type of atom.
Fracture
- the tendency of a mineral to break along curved or irregular surfaces.
Hardness
- the resistance of a mineral to being scratched.
Luster
- the way the surface of a mineral reflects light.
Mineral
- a substance that forms in nature, has a definite chemical makeup, and has a crystal structure.
Streak
- 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