Daubréelite
Daubréelite is a rare sulfide mineral. It crystallizes with cubic symmetry and has chemical composition of Fe2+Cr3+2S4. It usually occurs as black platy aggregates.
| Daubréelite | |
|---|---|
Coahuila meteorite fragment ("type locality"), Mineralogical Museum, Natural History Museum, Harvard University | |
| General | |
| Category | Sulfide mineral |
| Formula (repeating unit) | Fe2+Cr3+2S4 |
| IMA symbol | Dbr |
| Strunz classification | 2.DA.05 |
| Dana classification | 02.10.01.11 |
| Crystal system | Cubic |
| Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
| Space group | Fd3m |
| Unit cell | a = 9.966 Å; Z = 8 |
| Identification | |
| Color | Black |
| Crystal habit | Massive, platy aggregates, exsolution lamellae in troilite |
| Cleavage | Distinct |
| Fracture | Uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 4.5–5 |
| Luster | Metallic |
| Streak | Brown or black |
| Diaphaneity | Opaque |
| References | |
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