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18 Cards in this Set

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Cleavage
the tendency of come minerals to break along certain crystalliographic planes
Luster
the quality and intensity of light reflected from the surface of a mineral
Streak
the color of a fine powder of a mineral usually obtained by rubbing the mineral on an unglazed porcelain plate
Hardness
the resistance of the surface of a mineral to scratching
Fracture
The manner in which minerals break other than along planes of cleavage
Foliation
layering in rock created by metamorphism
Bedding
layering that develops as sediments are deposited
Texture
the size, shape, and arrangmetn of mineral grains or crystals in rocks
Porosity
the proportion of the volume of a material that consists of open spaces
Intrusive
a rock formed when m agma solidifies within bodies of pre-existing rock
Extrusion
an igneous rock formed from materical that had erupted onto the surface of the earth
Clastic
rock composed of lithified clastic sediment
Precipitation
a chemical reaction that produces a solid salt
Deformation
folding, faulting and other changes in shape of rocks or minerals in response to mechanical forces such as those that occur in tectonically active regions
pyroclastic debris
any rock made up to material ejected explosivly from a volcanic vent
lava
fluid magma that flows onto the Earth's surface from a volcano or fissure. Also, the rock formed by the solidification of the same material
ash flow
a mixture of volcanic ash, larger pyroclastic particles, and gas that flows rapidly along the Earth's surface as a result of an explosive volcanic eruption
Stratovolcano
a steep sided volcano formed by an alternating series of lava flows and pyroclastic eruptions