Input interpretation
dravite (mineral) | ganophyllite (mineral)
Images
Images
General properties
| dravite | ganophyllite alternate names | magnesium-tourmaline | coronite | gouverneurite | magnodravite | Mg-tourmaline | (none) formula | NaMg_3Al_6(BO_3)_3Si_6O_18(OH)_4 | (K, Na)_2(Mn, Al, Mg)_8(Si, Al)_12O_29(OH)_7·8(H_2O) discovery year | 1883 | 1890
Basic properties
| dravite | ganophyllite density | 3.09 g/cm^3 | 2.84 g/cm^3 transparency | transparent | translucent | opaque | transparent | translucent birefringence | 0.022 | 0.076 luster | vitreous | resinous | vitreous | glassy Mohs hardness | 7.25 | 4.25 tenacity | brittle | streak | colorless | brownish yellow magnetism | nonmagnetic | nonmagnetic color | black | green | red | blue | white | brownish yellow | cinnamon brown fracture | subconchoidal | brittle molar mass | 958.8 g/mol | 1514 g/mol
Units
Mineral identifiers
| dravite | ganophyllite Strunz ID | VIII/E.19-20 | VIII/H.17-60 Dana ID | 61.3e.1.9 | 74.1.2.1 ICSD number | | ICSD64788
Crystallographic properties
| dravite | ganophyllite crystal system | trigonal | monoclinic crystal class | 3m | 2/m unit cell volume | 1585 Å^3 (cubic ångströms) | 22545 Å^3 (cubic ångströms) d-spacing | 2.576 Å (ångströms) | 2.961 Å (ångströms) | 3.99 Å (ångströms) | 12.5 Å (ångströms) | 3.14 Å (ångströms) | 2.7 Å (ångströms) intensity | 100% | 85% | 85% | 100% | 25% | 14% molecules per unit cell | 3 molecules per cell | 10 molecules per cell refractive indices | 0 | 0 | 0 | 1.643 | 1.621 | 0 | 1.537 | 0 | 0 | 0 | 0 | 0 dispersion | weak | weak unit cell lengths | 15.94 Å (ångströms) | 7.201 Å (ångströms) | 7.201 Å (ångströms) | 16.6 Å (ångströms) | 27.13 Å (ångströms) | 50.18 Å (ångströms) unit cell angles | 90° (degrees) | 90° (degrees) | 120° (degrees) | 90° (degrees) | 93.96° (degrees) | 90° (degrees)