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Texas A&M Geology 101
Lab Review: General vocab
10
Geology
Undergraduate 1
02/22/2010

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Term
Mineral
Definition
Inorganic, naturally occurring substances that have a characteristic chemical composition, distinctive physical properties, and crystalline structure.
Term
Rock
Definition
Solid materials that comprise most of Earth, our Moon, and the other rocky planets of our solar system.
Term
Luster
Definition
how light reflects from the surface of an object, such as a mineral. Metallic and non-metallic
Term
magma
Definition
Molten (heated until liquefied) rock exists in isolated bodies below earth's surface.
Term
Intrusion
Definition
a body of magma that makes it's way to the earth's surface.
Term
intrusive igneous rock
Definition
an intrusion that has cooled to form a coarse-grained rock with visible mineral crystals.
Term
Lava
Definition
Bubbly magma that erupts the the earth's surface.
Term
Extrusive Igneous Rock
Definition
When lava on earth's surface quick cools, fine grained, comprised of tiny crystals and or glass.
Term
Phenocryst
Definition
The crystals that stand out form the background in Porphyritic textured igneous rocks.
Term
Groundmass
Definition
the "background" on Porphyritic igneous rocks.
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