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18 Cards in this Set
- Front
- Back
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Cleavage
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the tendency of come minerals to break along certain crystalliographic planes
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Luster
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the quality and intensity of light reflected from the surface of a mineral
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Streak
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the color of a fine powder of a mineral usually obtained by rubbing the mineral on an unglazed porcelain plate
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Hardness
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the resistance of the surface of a mineral to scratching
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Fracture
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The manner in which minerals break other than along planes of cleavage
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Foliation
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layering in rock created by metamorphism
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Bedding
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layering that develops as sediments are deposited
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Texture
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the size, shape, and arrangmetn of mineral grains or crystals in rocks
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Porosity
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the proportion of the volume of a material that consists of open spaces
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Intrusive
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a rock formed when m agma solidifies within bodies of pre-existing rock
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Extrusion
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an igneous rock formed from materical that had erupted onto the surface of the earth
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Clastic
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rock composed of lithified clastic sediment
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Precipitation
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a chemical reaction that produces a solid salt
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Deformation
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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
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pyroclastic debris
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any rock made up to material ejected explosivly from a volcanic vent
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lava
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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
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ash flow
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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
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Stratovolcano
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a steep sided volcano formed by an alternating series of lava flows and pyroclastic eruptions
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