Fingerite

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
CategoryVanadate mineral
Formula
(repeating unit)
β-Cu2V2O5
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
References[1][2][3]

Associated minerals include thenardite, euchlorine, stoiberite, shcherbinaite, ziesite, bannermanite, chalcocyanite and chalcanthite.[1] The mineral also dissolves in water.

Fingerite is named for Dr. Larry W. Finger (b. 1940) of the Geophysical Laboratory, Carnegie Institution of Washington.

References

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