| Fingerite | |
|---|---|
| General | |
| Category | Vanadate mineral |
| Formula (repeating unit) | β-Cu2V2O5 |
| IMA symbol | Fgr[1] |
| Strunz classification | 8.BB.80 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) 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 |
| Solubility | Dissolves in water |
| References | [2][3][4] |
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.[2] The mineral also dissolves in water.[5]
Fingerite is named for Dr. Larry W. Finger (b. 1940) of the Geophysical Laboratory, Carnegie Institution of Washington.
References
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- 1 2 Fingerite in The Handbook of Mineralogy
- ↑ Fingerite on Mindat.org
- ↑ Fingerite data on Webmineral
- ↑ "For a special Valentine? Beyond diamonds and gems: The world's rarest minerals". Retrieved November 15, 2023.
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