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Fingerite 
Summary
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.
| 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] |
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 edit
- ^ 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.
- ^ a b 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.