Fingerite

(repeating unit)β-Cu2V2O5IMA symbolFgr[1]Strunz classification8.BB.80Crystal systemTriclinicCrystal classPinacoidal (1)
H-M symbol: (1)Space groupP1Unit cella = 8.16, b = 8.27
c = 8.04 [Å]; α = 107.14°
β = 91.39°, γ = 106.44°; Z = 1IdentificationColorBlack; medium gray in reflected lightCrystal habitSubhedral or anhedral; equant or platelike; up to 150 μmCleavageNoneLusterMetallicStreakDark reddish brownDiaphaneityOpaqueDensity4.78Optical propertiesBiaxialSolubilityDissolves in waterReferences[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. 1940-2024)of the Geophysical Laboratory, Carnegie Institution of Washington.

References

  1. ^ 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.
  2. ^ a b Fingerite in The Handbook of Mineralogy
  3. ^ Fingerite on Mindat.org
  4. ^ Fingerite data on Webmineral
  5. ^ "For a special Valentine? Beyond diamonds and gems: The world's rarest minerals". Retrieved November 15, 2023.


  • v
  • t
  • e