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Reference.org
Anorthite
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<p>Anorthite (< <i>an</i> 'not' + <i>ortho</i> 'straight') is the <a href="/facts/Calcium/hf252CC0">calcium</a> <a href="/facts/Endmember/ftb6zfhy">endmember</a> of the <a href="/facts/Plagioclase_feldspar/X0XLHGKU">plagioclase feldspar</a> mineral series. The chemical formula of pure anorthite is Ca<a href="/facts/Aluminium/7wmR8jYE">Al</a>2<a href="/facts/Silicate/7NdthSRM">Si2O8</a>. Anorthite is found in <a href="/facts/Igneous_rock/xeMJhUah">igneous rocks</a>. </p>