Fingerite
General
CategoryVanadate mineral
Formula
(repeating unit)
β-Cu2V2O5
IMA symbolFgr[1]
Strunz classification8.BB.80
Crystal systemTriclinic
Crystal classPinacoidal (1)
H-M symbol: (1)
Space groupP1
Unit cella = 8.16, b = 8.27
c = 8.04 [Å]; α = 107.14°
β = 91.39°, γ = 106.44°; Z = 1
Identification
ColorBlack; medium gray in reflected light
Crystal habitSubhedral or anhedral; equant or platelike; up to 150 μm
CleavageNone
LusterMetallic
StreakDark reddish brown
DiaphaneityOpaque
Density4.78
Optical propertiesBiaxial
SolubilityDissolves 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

  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. 1 2 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.


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