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picrites
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Definitions of picrites in various dictionaries:
adj - an igneous rock [n -S] : PICRITIC
PICRITES - Picrite basalt, picrobasalt is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine. It is dark with yellow-green oliv...
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| Plural form of picrite. |
| A dark basaltic igneous rock rich in olivine. |
| Picrites description |
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Picrite basalt, picrobasalt is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine. It is dark with yellow-green olivine phenocrysts (20 to 50%) and black to dark brown pyroxene, mostly augite. * The olivine-rich picrite basalts that occur with the more common tholeiitic basalts of Klauea and other volcanoes of the Hawaiian Islands are the result of accumulation of olivine crystals either in a portion of the magma chamber or in a caldera lava lake.[1] The compositions of these rocks are well represented by mixes of olivine and more typical tholeiitic basalt. * The name "picrite" can also be applied to an olivine-rich alkali basalt: such picrite consists largely of phenocrysts of olivine and titanium-rich augite pyroxene with minor plagioclase set in a groundmass of augite and more sodic plagioclase and perhaps analcite and biotite. * Picrites and komatiites are somewhat similar chemically, but differ in that komatiite lavas are products of more magnesium-rich |