plagioclase

(redirected from Plagioclase feldspar)
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Related to Plagioclase feldspar: anorthite, alkali feldspar, mica
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  • noun

Synonyms for plagioclase

any of a series of triclinic feldspars that form rocks

References in periodicals archive ?
These are two types of feldspars of which plagioclase feldspars are more abundant than K-feldspars like orthoclase and microcline.
Acid igneous rock fragments: composed of quartz, alkali feldspar, plagioclase feldspar, and occasional muscovite/and or biotite mica, amphibole, and microcline.
The rock is composed of coarse-grained, intergrown quartz and potassium feldspar, with minor plagioclase feldspar and horn-blende, the latter usually altered to chlorite and epidote (yon Gruenewaldt, 1968).
The xenolith rocks consist mainly of amphiboles (79%) and mica (11%) while the predominant minerals in the matrix are mica (48%), plagioclase feldspar (27%) with lesser amounts of amphiboles (11%).
LOS ANGELES (CyHAN)- NASA's Curiosity rover gets its first taste of Mars and finds minerals: plagioclase feldspar, pyroxene and olivine.
b) Disseminated type mineralization occurs in the Launay felsic intrusive rocks where gold-bearing pyrite is disseminated in a massive intrusive phase rich in plagioclase feldspar ("albitite"); this type of mineralization is found in Zone "75".
Further, the petrographic description of the intrusive and metamorphic units describes a widespread weak-to-moderate early and hot potassic alteration, expressed as biotite and K-spar alteration of mafic minerals and K-spar alteration of plagioclase feldspars.
Quartz, Plagioclase feldspars and K- feldspars showed their presence in studied samples by petrographic study (Table 2 and Figure 2).