Picrite | Igneous, Basaltic, Olivine | Britannica
网页picrite, intrusive igneous rock of ultramafic (very silica-poor) composition that is composed largely of olivine and augite and is somewhat similar to peridotite. Picrites are dark, heavy rocks and contain a small but variable amount of plagioclase feldspar; hornblende and biotite may also be present.
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Picrite basalt - Wikipedia
网页Picrite basalt or 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 (20-50%) and black to dark brown pyroxene, mostly augite.
苦橄岩 - 百度百科
网页苦橄岩（Picrite）属于 超基性 的喷出岩。岩石呈暗绿色或灰绿色。矿物成分以橄榄石和辉石为主，可含少量斜长石，角闪石极少。其中橄榄石约占50～75%。副矿物可见 磁铁矿 、铬铁矿及磷灰石等。
Picrite - an overview | ScienceDirect Topics
网页Picrite -basalt or picrobasalt is a variety of high-magnesium olivine-rich basalt. It is dark with yellow-green olivine phenocrysts (20–50%) and black to dark brown pyroxene, mostly augite. It often associates with tholeiitic basalts and olivine-rich alkali basalts. Picrites and komatiites are similar chemically.
Picrite: Mineral information, data and localities. - mindat.org
网页About Picrite Hide. Picritic rocks (fine grained ultramafic or basaltic rocks with <53% SiO2, (Na2O+K2O)18%) defined chemically as having 1-2% (Na2O+K2O). May comprise fine grained olivine and pyroxenes, but commonly altered to chlorite and serpentine.
Picrite - SpringerLink
网页G. Tschermak, in 1866, first applied the term pikrit to melanocratic derivatives of teschenitic igneous rocks from Silesia (on the border between Czechoslovakia and Poland), rich in olivine and containing hornblende, titaniferous augite, and ilmenite with small amounts of plagioclase and analcime and accessory biotite and apatite (see Johannsen ...
Picrite Rock | History | Origin - Compare Nature
网页Picrite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.
Picrite - Natural Atlas
网页Picrite. Picrite basalt or 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 (20-50%) and black to dark brown pyroxene, mostly augite.
Picrite - Encyclopedia
网页PICRITE (from Gr. 7ru<pbs, bitter, because these rocks are rich in magnesia, a base which forms bitter salts), a. rock belonging to the ultrabasic group, and consisting mainly of olivine and augite often with hornblende and biotite and …
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