Fingerite
| Fingerite | |
|---|---|
| General | |
| Category | Vanadate mineral |
| Formula (repeating unit) | β-Cu2V2O5 |
| Strunz classification | 8.BB.80 |
| Crystal system | Triclinic Pinacoidal class |
| Space group | Triclinic H-M symbol: (1) Space group: P1 |
| Unit cell | a = 8.16, b = 8.27 c = 8.04 [Å]; α = 107.14° β = 91.39°, γ = 106.44°; Z = 1 |
| Identification | |
| Color | Black; medium gray in reflected light |
| Crystal habit | Subhedral or anhedral; equant or platelike; up to 150 μm |
| Cleavage | None |
| Luster | Metallic |
| Streak | Dark reddish brown |
| Diaphaneity | Opaque |
| Density | 4.78 |
| Optical properties | Biaxial |
| References | [1][2][3] |
Fingerite is a copper vanadate mineral with formula: β-Cu2V2O5. It was discovered as triclinic crystals occurring as volcanic sublimates around fumaroles in the crater of the Izalco Volcano, El Salvador.
Associated minerals include thenardite, euchlorine, stoiberite, shcherbinaite, ziesite, bannermanite, chalcocyanite and chalcanthite.[1]
Fingerite is named for Larry W. Finger (b. 1940) of the Carnegie Institution.