Mineral | Dravite |
---|---|
Formula | NaMg3Al6(BO3)3Si6O18(OH)4 |
Crystal Form | Trigonal/Ditrigonal Pyramidal [3m] |
Cleavage | [1011] Indistinct |
Color | Pale brown to Dark-brown to Brownish-black, Dark-yellow, Blue |
Density | 3.0 – 3.2 g/cm3 |
Diaphaneity | Transparent, Translucent |
Fracture | Irregular/Uneven, Conchoidal |
Hardness | 7.5 |
Lustre | Vitreous, Resinous |
Streak | Light brown, rarely White |
Type Loc. | Dobrova, Dravograd, Slovenia |
Dana 8 Class | 61.3.1.10 |
Strunz Class | VIII/E.19-50 |
Mindat | mindat.org |
WebMineral | WebMineral |
ID | 368 |