Zinclipscombite

Zinclipscombite is a dark-green to brown zinc iron phosphate mineral with the formula Zn(Fe3+)2(PO4)2(OH)2.[1][2] It occurs as fibrous spheres and exhibits tetragonal crystal structure.[1]

Zinclipscombite
Zinclipscombite: Pale green balls and crystal clusters. Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, US
General
CategoryPhosphate mineral
Formula
(repeating unit)		Zn(Fe3+)2(PO4)2(OH)2
Strunz classification8.BB.90
Dana classification41.10.02.02
Crystal systemTetragonal
Crystal classTrapezohedral (422)
H-M symbol: (4 2 2)
Space groupP43212
Unit cella = 7.242, c = 13.125 [Å]; Z = 4
Identification
Formula mass386.04 g/mol
ColorDark green to brown
CleavageNone
FractureBrittle
Mohs scale hardness5
LusterVitreous
StreakLight green to tan
DiaphaneityTranslucent
Specific gravity3.65
Optical propertiesUniaxial
Refractive indexnω=1.755, nε=1.795
Birefringence0.0400
References[1][2]

In the classification of non-silicate minerals zinclipscombite is in the lipscombite group, which also includes lipscombite.

Discovery

The mineral zinclipscombite was discovered and named by Chukanov, Pekov, Möckel, Zadov, and Dubinchuk [3][4] from a sample from the Silver Coin mine, Edna Mountain, Valmy, Humboldt County, Nevada, United States. The new mineral name was approved in 2006 by the Commission on New Minerals and Mineral Names, International Mineralogical Association.

References
  1. Mindat
  2. WebMineral
  3. Chukanov, N. V., Pekov, I. V., Möckel, S., Zadov, A. E., and Dubinchuk V. T. Zinclipscombite, ZnFe 23+ (PO4)2(OH)2, a new mineral species Geology of Ore Deposits, 49, 7, 509-513, doi:10.1134/S1075701507070033
  4. Chukanov, N. V., Pekov, I. V., Möckel, S., Zadov, A. E., and Dubinchuk V. T. (2006): Zinclipscombite ZnFe3+2(PO4)2(OH)2 – a new mineral. Proceedings of the Russian Mineralogical Society, 135(6), 13–18.

Gallery of zinclipscombite pictures at mindat.org.


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