Input interpretation
acuminite (mineral) | scacchite (mineral)
Images
Images
General properties
| acuminite | scacchite formula | SrAlF_4(OH)·(H_2O) | MnCl_2 discovery year | | 1869
Basic properties
| acuminite | scacchite density | 3.295 g/cm^3 | 2.977 g/cm^3 transparency | transparent | transparent birefringence | 0.01185 | 0.086 luster | vitreous | Mohs hardness | 3.5 | 1 streak | white | white magnetism | nonmagnetic | nonmagnetic color | colorless | colorless | rose red | brown | brownish red molar mass | 225.6 g/mol | 125.8 g/mol
Units
Mineral identifiers
| acuminite | scacchite Strunz ID | III/C.01-20 | III/A.07-20 Dana ID | 11.6.17.1 | 9.2.3.2 IMA number | IMA1986-038 | ICSD number | ICSD33830 | ICSD33752
Crystallographic properties
| acuminite | scacchite crystal system | monoclinic | trigonal crystal class | 2/m | -32/m unit cell volume | 906.6 Å^3 (cubic ångströms) | 205 Å^3 (cubic ångströms) d-spacing | 3.505 Å (ångströms) | 4.706 Å (ångströms) | 4.767 Å (ångströms) | 5.85 Å (ångströms) | 2.59 Å (ångströms) | 3.16 Å (ångströms) intensity | 100% | 100% | 100% | 100% | 80% | 25% molecules per unit cell | 8 molecules per cell | 3 molecules per cell 2V angle | 103 π/360 radians≈103/2° (degrees) | refractive indices | 1.451 | 1.453 | 1.463 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.622 | 0 dispersion | r > v | strong | unit cell lengths | 13.22 Å (ångströms) | 5.175 Å (ångströms) | 14.25 Å (ångströms) | 3.68 Å (ångströms) | 17.48 Å (ångströms) | 17.48 Å (ångströms) unit cell angles | 90° (degrees) | 111.6° (degrees) | 90° (degrees) | 90° (degrees) | 90° (degrees) | 120° (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.