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13 terms

Minerals and Rocks

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cleavage
the tendency of a mineral to break along flat surfaces
crystal
a solid in which the atoms are arranged in a pattern that repeats again and again
fracture
the tendency of a mineral to break apart in an irregular way
hardness
a measure of how easily a mineral can be scratched
luster
the way a mineral reflects light
mineral
a solid inorganic substance occurring in nature having a definite chemical composition
rock
a naturally occurring solid mixture of one or more minerals or organic matter
streak
the color of the powder left when a mineral is rubbed against a hard rough surface
magma
molten rock beneath the earth's surface
specific gravity
ratio of a mineral's weight compared with the weight of an equal volume of water
igneous rock
produced by fire, great heat, or the action of a volcano; formed by the cooling and solidification of magma.
sedimentary rock
a type of rock that form from particles of other rocks or the remains of plants and animals under intense pressure and are then cemented together
metamorphic rock
A type of rock that forms from an existing rock that is changed by heat, moisture and pressure