Zinclipscombite

Zinclipscombite is a dark-green to brown zinc iron phosphate mineral with the formula Zn(Fe³⁺)₂(PO₄)₂(OH)₂.^[2][3] It occurs as fibrous spheres and exhibits tetragonal crystal structure.^[2]

Zinclipscombite
Zinclipscombite: Pale green balls and crystal clusters. Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, US
General
Category	Phosphate mineral
Formula	Zn(Fe3+)2(PO4)2(OH)2
IMA symbol	Zlcb[1]
Strunz classification	8.BB.90
Dana classification	41.10.02.02
Crystal system	Tetragonal
Crystal class	Trapezohedral (422) H-M symbol: (4 2 2)
Space group	P43212
Unit cell	a = 7.242, c = 13.125 [Å]; Z = 4
Identification
Formula mass	386.04 g/mol
Color	Dark green to brown
Cleavage	None
Fracture	Brittle
Mohs scale hardness	5
Luster	Vitreous
Streak	Light green to tan
Diaphaneity	Translucent
Specific gravity	3.65
Optical properties	Uniaxial
Refractive index	nω = 1.755, nε = 1.795
Birefringence	0.0400
References	[2][3]

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 ^[4][5] 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.