Anorthite
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Anorthite is the calcium endmember of the plagioclase feldspar mineral series. The chemical formula of pure anorthite is CaAl2Si2O8. Anorthite is found in igneous rocks.
Anorthite crystals in a basalt vug from Vesuvius (size:6.9 × 4.1 × 3.8 cm)
Anorthite crystals (white) in lava from Miyake Island, Japan (size: 2.4 × 1.7 × 1.7 cm)
Anorthosite
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Anorthosite is a phaneritic, intrusive igneous rock characterized by its composition: mostly plagioclase feldspar, with a minimal mafic component. Pyroxene, ilmenite, magnetite, and olivine are the ma
Anorthosite from Salem district, Tamil Nadu, India
Nain Anorthosite, a mid-Mesoproterozoic intrusion (1.29 to 1.35 billion years), Labrador. Polished slab; blue color is labradorescence.
Anorthosite from southern Finland
Anorthosite from Poland