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Oligoclase

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oligoclase [′äl·ə·gō‚klās]
(mineralogy)
A plagioclase feldspar mineral with a composition ranging from Ab90An10to Ab70An30, where Ab = NaAlSi3O8and An = CaAl2O8.
Oligoclase 

a rock-forming mineral of the feldspar (plagio-clase) group; an isomorphous mixture of 10–30 percent anorth-ite, Ca[Al2Si2O8], and 70–90 percent albite, Na[AlSi3O8].
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Day and his colleagues immediately recognized that these meteorites were unusual because of elevated contents of a light-colored feldspar mineral called oligoclase.
Scientists find first ever evidence of asteroids with Earth-like crust by Asian News International
The first theories implied that the disintegration could be caused by a chemical weathering of oligoclase in granite.
Surface weathering of rapakivi granite outcrops--implications for ... by Harma, Paavo; Selonen, Olavi / Estonian Journal of Earth Sciences
Architecture of Arquipa The main feature is the light and shadow contrasts cut into the stone, which is sillar, a white volcanic rock composed of feldspar, oligoclase, glass, quartz, biotite, and ferric oxide.
Arequipa by Gill, Nicholas / Peru Adventure Guide
 
 
 
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