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14 Cards in this Set
- Front
- Back
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Viscosity |
Viscosity is a measure of the resistance of a fluid to deformation under shear stress. It is commonly perceived as "thickness", or resistance to pouring. Viscosity describes a fluid's internal resistance to flow and may be thought of as measure of fluid friction. Thus water is thin, having a low viscosity, while vegetable oil is "thick" having a high viscosity. |
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Felsic |
Consisting chiefly of feldspars, feldsparthoids, quartz, and other light-colored minerals. |
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Intermediate |
(Of such igneous rocks as syenite) containing between 55 and 66 percent silica. |
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Mafic |
Dark colored rock; usually applied to igneous and metamorphic rocks containing magnesium and iron rich minerals. |
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Ultramafic |
An igneous rock with a very low silica content and rich in minerals such as hypersthene, augite, and olivine. These rocks are also known as ultrabasic rocks. Examples include peridotite, kimberlite, lamprophyre, lamproite, dunite, and komatite. |
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Aphanitic |
A fine grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye. |
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Phaneritic |
Of or relating to an igneous rock in which the crystals are so coarse that individual minerals can be distinguished with the naked eye. |
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Porphyritic |
Having distinct crystals (as of feldspar) in a relatively fine grained base. |
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Phenocrysts |
One of the prominent embedded crystals of a porphyry. |
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Pahoehoe |
A Hawaiian tern for a lava flow that has a surface flow structure that looks like coiled rope or cord. Lava with a relatively low viscosity can form a "ropy" surface. The term is also used for the rock materials after the flow has cooled. |
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Pyroclastic |
The word "pyroclastic" is an adjective used for volcanic clasts that are blown from a volcanic vent. Rocks and rock material of a volcanic origin are also called "pyroclasts". |
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Pegmatitic |
A coarsely crystalline granite or other high -silica rock occurring in veins or dikes. |
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Pillow Lava |
Lava that forms from an underwater eruption and is characterized by pillow shaped masses. |
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Vesicular |
Containing , composed of , or characterized by vesicles <vesicular lava> (swiss cheese like holes) |
