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Chapter 4 Vocab

Earth Science CH. 4

TermDefinition
mineral naturally occurring, inorganic solid with a specific chemical composition and a definite crystalline structure.
crystal solid in which atoms are arranged in repeating patterns.
luster the way that a mineral reflects light from its surface; two types- metallic and nonmetallic
cleavage the manner in which a mineral breaks along planes where atomic bonding is weak.
fracture when a mineral breaks into pieces which arclike, rough, or jagged edges.
streak color a mineral leaves when it is rubbed across an unglazed porcelain plate or when its is broken up and powdered.
specific gravity ratio of the mass of a substance to the mass of an equal volume of H2O and 4 C.
hardness measure of how easily a mineral can be scratched which is determined by the arrangement of a mineral's atoms.
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