Input interpretation
acuminite (mineral)
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General properties
formula | SrAlF_4(OH)·(H_2O)
Basic properties
density | 3.295 g/cm^3 transparency | transparent birefringence | 0.01185 luster | vitreous Mohs hardness | 3.5 streak | white magnetism | nonmagnetic color | colorless molar mass | 225.6 g/mol (grams per mole)
Units
Mineral identifiers
Strunz ID | III/C.01-20 Dana ID | 11.6.17.1 IMA number | IMA1986-038 ICSD number | ICSD33830
Crystallographic properties
crystal system | monoclinic crystal class | 2/m unit cell volume | 906.6 Å^3 (cubic ångströms) d-spacing | 3.505 Å (ångströms) | 4.706 Å (ångströms) | 4.767 Å (ångströms) intensity | 100% | 100% | 100% molecules per unit cell | 8 molecules per cell 2V angle | 103 π/360 radians≈103/2° (degrees) refractive indices | 1.451 | 1.453 | 1.463 | 0 | 0 | 0 dispersion | r > v | strong unit cell lengths | 13.22 Å (ångströms) | 5.175 Å (ångströms) | 14.25 Å (ångströms) unit cell angles | 90° (degrees) | 111.6° (degrees) | 90° (degrees)
Wikipedia summary
Acuminite is a rare halide mineral of with chemical formula: SrAlF_4(OH)·(H_2O). Its name comes from the Latin word acumen, meaning "spear point". Its Mohs scale rating is 3.5.