Input interpretation
acuminite (mineral) | rokühnite (mineral)
Images
Images
General properties
| acuminite | rokühnite alternate names | (none) | rokuehnite formula | SrAlF_4(OH)·(H_2O) | Fe^(2+)Cl_2·(H_2O)
Basic properties
| acuminite | rokühnite density | 3.295 g/cm^3 | 2.35 g/cm^3 transparency | transparent | transparent birefringence | 0.01185 | 0.097 luster | vitreous | Mohs hardness | 3.5 | streak | white | magnetism | nonmagnetic | nonmagnetic color | colorless | colorless molar mass | 225.6 g/mol | 144.8 g/mol
Units
Mineral identifiers
| acuminite | rokühnite Strunz ID | III/C.01-20 | III/A.12-50 Dana ID | 11.6.17.1 | 9.2.4.1 IMA number | IMA1986-038 | IMA1979-036 ICSD number | ICSD33830 |
Crystallographic properties
| acuminite | rokühnite crystal system | monoclinic | monoclinic crystal class | 2/m | 2/m unit cell volume | 906.6 Å^3 (cubic ångströms) | 225.5 Å^3 (cubic ångströms) d-spacing | 3.505 Å (ångströms) | 4.706 Å (ångströms) | 4.767 Å (ångströms) | 5.53 Å (ångströms) | 2.762 Å (ångströms) | 4.228 Å (ångströms) intensity | 100% | 100% | 100% | 100% | 70% | 60% molecules per unit cell | 8 molecules per cell | 2 molecules per cell 2V angle | 103 π/360 radians≈103/2° (degrees) | 11 π/30 radians≈66° (degrees) refractive indices | 1.451 | 1.453 | 1.463 | 0 | 0 | 0 | 1.605 | 0 | 0 | 0 | 0 | 0 dispersion | r > v | strong | strong unit cell lengths | 13.22 Å (ångströms) | 5.175 Å (ångströms) | 14.25 Å (ångströms) | 7.396 Å (ångströms) | 8.458 Å (ångströms) | 3.638 Å (ångströms) unit cell angles | 90° (degrees) | 111.6° (degrees) | 90° (degrees) | 90° (degrees) | 97.68° (degrees) | 90° (degrees)
Wikipedia summary
Acuminite
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.