Input interpretation
anorthite (mineral)
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General properties
alternate names | ab0 | amphodelite | anorthoîte | anortite | barsovite | beffanite | beffonite | biotine | calciclase | calcium feldspar | christianite | cyclopite | didymolite | indianite | latrobite | lepolite | lime-feldspar | thiorsauite | plagioclase (An90-100) formula | CaAl_2Si_2O_8 discovery year | 1823
Basic properties
density | 2.735 g/cm^3 transparency | transparent | subtransparent | translucent birefringence | 0.0115 luster | vitreous Mohs hardness | 6.25 tenacity | brittle streak | white magnetism | nonmagnetic color | colorless | gray | white | red | reddish gray fracture | uneven molar mass | 277.4 g/mol (grams per mole)
Units
Mineral identifiers
Strunz ID | VIII/J.07-70 Dana ID | 76.1.3.6
Crystallographic properties
crystal system | triclinic crystal class | 1 unit cell volume | 1340 Å^3 (cubic ångströms) d-spacing | 3.2 Å (ångströms) | 3.18 Å (ångströms) | 4.04 Å (ångströms) intensity | 100% | 75% | 60% molecules per unit cell | 8 molecules per cell 2V angle | 13 π/30 radians≈78° (degrees) refractive indices | 1.574 | 1.581 | 1.586 | 0 | 0 | 0 dispersion | weak unit cell lengths | 8.177 Å (ångströms) | 12.88 Å (ångströms) | 14.17 Å (ångströms) unit cell angles | 93.17° (degrees) | 115.9° (degrees) | 91.22° (degrees)
Wikipedia summary
Anorthite is the calcium endmember of the plagioclase feldspar mineral series. The chemical formula of pure anorthite is CaAl_2Si_2O_8. Anorthite is found in mafic igneous rocks. Anorthite is rare on the Earth but abundant on the Moon.