Input interpretation
allactite (mineral)
Image
Image
General properties
alternate names | allaktite | elfstorpite formula | Mn_7(AsO_4)_2(OH)_8 discovery year | 1884
Basic properties
density | 3.83 g/cm^3 transparency | translucent birefringence | 0.019 luster | vitreous | greasy Mohs hardness | 4.5 tenacity | brittle streak | grayish | faint brown magnetism | nonmagnetic color | brown red | greenish brown | purple red | pink fracture | irregular | uneven molar mass | 798.5 g/mol (grams per mole)
Units
Mineral identifiers
Strunz ID | VII/B.15-50 Dana ID | 41.2.1.1
Crystallographic properties
crystal system | monoclinic crystal class | 2/m unit cell volume | 672.5 Å^3 (cubic ångströms) d-spacing | 3.06 Å (ångströms) | 3.71 Å (ångströms) | 3.28 Å (ångströms) intensity | 100% | 65% | 55% molecules per unit cell | 2 molecules per cell 2V angle | π/10 radians≈18° (degrees) refractive indices | 1.755 | 0 | 0 | 0 | 0 | 0 dispersion | r > v | strong unit cell lengths | 11.03 Å (ångströms) | 12.12 Å (ångströms) | 5.51 Å (ångströms) unit cell angles | 90° (degrees) | 114.1° (degrees) | 90° (degrees)