God for us to design products, we are the porters of nature!
| Dravite | |
Chemical Formula |
(Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6(BO3)3(Si,Al,B)6O18(OH,F)4[1][2] |
Species |
Silicates |
Crystal System |
Trigonal |
Mohs Scale |
7 |
Specific Gravity |
3.06 |
Color |
Most commonly black, but can range from brown, Purple, green, pink, or in a dual-colored pink and green. |
Streak |
White |
Luster |
Vitreous, Resinous |
Refractive Index |
n = 1.634 - 1.661 n = 1.612 - 1.632 |
Diaphaneity |
Transparent, Translucent |
Cleavage |
Poor/IndistinctVery poor |
Fracture |
Irregular/Uneven, Conchoidal |
| Crystal Habit：Parallel and elongated. Acicular prisms, sometimes radiating. Massive. Scattered grains (in granite). | |
| Geological Setting：Metamorphosed limestones or mafic igneous rocks, rarely in pegmatites or authogenic overgrowths in sedimentary rocks. | |
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