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ES Ch 3 Vocab

Glencoe

AB
GemsBeautiful, rare, and highly prized mineral that can be worn in jewelry
MagmaHot, melted rock material beneath Earth's surface
HardnessHow easily a mineral can be scratched
FracturePhysical property of some minerals that causes them to break with uneven, rough, or jagged surfaces
CleavagePhysical property of some minerals that causes them to break along smooth, flat surfaces p. 71
SilicateDescribes a mineral that contains silicon and oxygen and usually one or more other elements p. 66
MineralsNaturally occurring inorganic solid with definite chemical composition and orderly arrangement of atoms
Specific GravityRatio of its weight, compared to weight of an equal volume of water.
CrystalSolid in which atoms are arranged orderly, repeating pattern p. 63
OreUseful substance that can be mined at a profit.
LusterDescribes the way a mineral reflects light from its surface; can be metallic or nonmetallic p. 70
StreakColor of a mineral when it is in powder form


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