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18 terms

Rocks and Minerals

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extrusive
these types of igneous rocks are formed as lava cools on the surface of Earth
density
mass per unit volume
streak
the color of a mineral in powdered form
luster
The way a mineral reflects light
intrusive
a type of ingneous rock that generally contains large crystals and forms when magma cools slowly beneath Earth's surface.
cleavage
the tendency of a mineral to break along flat surfaces
fracture
the tendency of a mineral to break along curved or irregular surfaces
foliated
Term used to describe metamorphic rocks whose grains are arranged in parallel layers or bands.
non-foliated
the metamorphic rock texture in which mineral grains are not arranged in planes or bands.
chemical
a type of sedimentary rock that form when dissolved minerals come out of solution
mineral
solid homogeneous inorganic substances occurring in nature having a definite chemical composition
rock
A naturally occurring solid mixture of one or more minerals or organic matter
igneous
rock formed from cooled magma or lava
sedimentary
rock formed when layers of sediments were pressed and cemented together
organic
sedimentary rocks made of material created by living things
clastic
sedimentary rock that forms when rock fragments are squeezed together
metamorphic
Rocks changed by intense heat or extreme pressure
sediment
solid rock or mineral fragments