Reinerite

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Reinerite
General
Category arsenite
Formula
(repeating unit)
Zn3(AsO3)2
Strunz classification 4.JA.10
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Unit cell a = 6.092 Å, b = 14.407 Å
c = 7.811 Å; Z = 4
V = 685.55
a:b:c = 0.423 : 1 : 0.542
Identification
Color Sky blue, yellow green
Crystal habit Rough striated pseudohexagonal crystals
Cleavage Good on {110}, {011} and {111}
Mohs scale hardness 5 - 5.5
Luster Vitreous to adamantine
Diaphaneity Transparent
Specific gravity 4.27
Optical properties Biaxial (-)
Refractive index nα = 1.740 nβ = 1.790 nγ = 1.820
Birefringence Maxium δ = 0.080
References [1][2][3][4]

Reinerite is a rare arsenite (arsenate(III)) mineral with chemical formula Zn3(AsO3)2.[2][3] It crystallizes in the orthorhombic crystal system.

Physical properties[edit]

Reinerite is most commonly found as a sky blue colored mineral, however, it may also be a light yellowish green color. Reinerite has a relative hardness of 5 to 5.5 on the Mohs Scale which is equivalent to that of a knife blade and or shard of glass. It has a density of 4.27 g/cm3,[1] and it exhibits a nonmetallic luster that may be described as glassy or vitreous.[5]

Environment[edit]

Reinerite develops in dolostone-hosted locations. It is known especially from Namibia, Africa, within the mines of Tsumeb. At the Tsumeb location, Reinerite develops within the polymetallic lead-zinc-copper deposit, 800 m (2,600 ft) below the surface, in the second oxidation zone.[4] It occurs in association with chalcocite, bornite, willemite, smithsonite, hydrozincite, hemimorphite, adamite, olivenite and gebhardite.[2]

History[edit]

Reinerite was first described in 1958 for an occurrence in the Tsumeb Mine, Tsumeb, Namibia and named for senior chemist Willy Reiner (1895–1965) of Tsumeb Corporation, who analyzed this mineral.[1][3]

References[edit]

  1. ^ a b c Webmineral data
  2. ^ a b c Handbook of Mineralogy
  3. ^ a b c Mindat.org
  4. ^ a b American Mineralogist
  5. ^ Lutgens, Frederick, and Edward Tarbuck. Essentials of Geology. 10th. Upper Saddle River, New Jersey: Pearson Prentice Hall, 2009. 42. Print.