Fingerite
| Fingerite | |
|---|---|
| General | |
| Category | Vanadate mineral |
| Formula (repeating unit) | β-Cu2V2O5 |
| Strunz classification | 08.BB.80 |
| Crystal system | Triclinic |
| Unit cell | a = 8.16 Å, b = 8.27 Å, c = 8.04 Å; α = 107.14; °β = 01.39°; Z=1 |
| Identification | |
| Color | Black; medium gray in reflected light |
| Crystal habit | Subhedral or anhedral; equant or platelike; up to 150 μm |
| Crystal symmetry |
Triclinic H-M symbol: (1) Space group: P1 |
| 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, chalcanthite.[1]
Named for Larry W. Finger (1940- ), American mineralogist, Carnegie Institution, Washington, D.C., USA.
References
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