Input interpretation
andesine (mineral)
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General properties
alternate names | ab60 | an40 | plagioclase (An30-50) formula | (Na, Ca)(Si, Al)_4O_8
Basic properties
density | 2.67 g/cm^3 transparency | transparent | subtransparent | translucent birefringence | 0.0085 luster | subvitreous Mohs hardness | 6.25 streak | white magnetism | nonmagnetic color | colorless | gray | yellow green | white fracture | uneven molar mass | 268.6 g/mol (grams per mole)
Units
Mineral identifiers
Strunz ID | VIII/J.07-40 Dana ID | 76.1.3.3
Crystallographic properties
crystal system | triclinic crystal class | 1 unit cell volume | 861.5 Å^3 (cubic ångströms) d-spacing | 3.21 Å (ångströms) | 3.18 Å (ångströms) | 4.04 Å (ångströms) intensity | 100% | 90% | 80% molecules per unit cell | 6 molecules per cell 2V angle | 4 π/9 radians≈80° (degrees) refractive indices | 1.549 | 1.553 | 1.557 | 0 | 0 | 0 dispersion | none unit cell lengths | 8.155 Å (ångströms) | 12.9 Å (ångströms) | 9.16 Å (ångströms) unit cell angles | 93.92° (degrees) | 116.3° (degrees) | 89.17° (degrees)
Wikipedia summary
Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series. Its chemical formula is (Ca, Na)(Al, Si)_4O_8, where Ca/(Ca + Na) (% anorthite) is between 30-50%. The formula may be written as Na_(0.7-0.5)Ca_(0.3-0.5)Al_(1.3-1.5)Si_(2.7-2.5)O_8.