Dravite
| ID | 79 | |
|---|---|---|
| Mineral | Dravite | |
| Location | Tomkap tourmaline mines - Yinnietharra - Western Australia - Australia | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Dravite information at mindat.org |
|
Mindat data
| ID | 1318 |
|---|---|
| Long ID | 1:1:1318:1 |
| Formula |
NaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
|
| IMA Status |
0 1 |
| Other Occurrences | Metamorphosed limestones or mafic igneous rocks, rarely in pegmatites or authogenic overgrowths in sedimentary rocks. |
| Discovery Year | 1883 |
| Diapheny | Transparent,Translucent |
| Cleavage |
Very poor |
| Tenacity | brittle |
| Colour | Pale brown to dark-brown to brownish-black, also dark-yellow, blue. |
| Hardness (min) | 7.0 |
| Hardness (max) | 7.0 |
| Luminescence | May fluoresce yellow to orange in SWUV, due to minor iron content. |
| Lustre | Vitreous to oily. |
| About the name | Named in 1883 by Gustav Tschermak for the river Drau (in Latin, Drave), on which the type locality is situated. |
| Streak | Light brown, rarely white. |
| Crystal System | Trigonal |
| Cleavage Type | Poor/Indistinct |
| Fracture type | Irregular/Uneven,Conchoidal |
| Morphology | Equant to short to long prismatic |
| Twinning |
Rare, on |
| UV | May weakly fluoresce under SW UV. |
| key_elements |
0 |
| shortcode_ima | Drv |
| Group | Tourmaline |
Details
Price: € 20
Dimensions: Not registered
Weight: 26 g
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Al | Aluminium | |
| B | Boron | |
| H | Hydrogen | |
| Mg | Magnesium | |
| Na | Sodium | |
| O | Oxygen | |
| Si | Silicium |