plagioclase feldspar

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Related to plagioclase feldspar: anorthite, alkali feldspar, mica

pla·gi·o·clase feldspar

 (plā′jē-ə-klās′, -klāz′, plăj′ē-)
Any of a series of triclinic feldspars that are a common constituent of rocks, consisting primarily of a mixture of sodium aluminum silicate, NaAlSi3O8, and calcium aluminum silicate, CaAl2Si2O8.

[Greek plagio-, plagio- + Greek klasis, breaking (from its oblique cleavage) (from klān, to break).]
References in periodicals archive ?
In the latest work, Fourier-transform infrared spectroscopy was used to analyze the water content in grains of plagioclase feldspar from lunar anorthosites, highland rocks composed of more than 90 percent plagioclase.
CHEMIN RESULTS REVEALED: NASA's Curiosity rover gets its first taste of Mars and finds minerals: plagioclase feldspar, pyroxene and olivine.
Just like the rocks on Earth, Moon's have lots of basalt and olivine, pyroxene, and mafic breccias, along with plagioclase feldspar, also known as anorthosite.
The detrial feldspars are mainly plagioclase feldspar with lesser amount of potash feldspar.