Xitieshanite

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Xitieshanite
General
Category Sulfate mineral
Formula
(repeating unit)
Fe3+(SO4)Cl·6(H2O)
Strunz classification 7.DC.20
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group P21/a
Unit cell a = 14.1 Å, b = 6.9 Å
c = 10.67 Å; β = 111.26°; Z = 4
Identification
Formula mass 313.47 g/mol
Color Green; yellow green
Crystal habit Acicular
Cleavage Uncertain / indistinct
Fracture Conchoidal to uneven
Mohs scale hardness 2.5 - 3
Luster Vitreous
Streak Yellow
Diaphaneity Transparent to translucent
Specific gravity 1.99
Optical properties Biaxial (-)
Refractive index nα = 1.536 nβ = 1.570 nγ = 1.628
Birefringence δ = 0.092
Pleochroism Colorless (x) to pale yellow (y) to light greenish yellow (z0
2V angle Measured: 77°
Dispersion r > v
References [1][2]

Xitieshanite is a hydrous iron sulfatechloride mineral with chemical formula: Fe3+(SO4)Cl·6(H2O).

It was discovered in 1983 and named for the discovery location of Xitieshan lead/zinc ore deposit in the Qinghai Province, China.[2] The mineral has also been reported in 2005 from acid mine drainage from a coal mine in Green Valley, Vigo County, Indiana.[3]

References[edit]

  1. ^ Xitieshanite mineral data from Webmineral
  2. ^ a b Mindat.org
  3. ^ Melchiorre, Erik, et al., A new occurrence of xitieshanite [Fe3+(SO4)Cl·6H2O] crystals in acid-mine seepways, Green Valley, Vigo County, Indiana, U.S.A., American Mineralogist, v. 90 no. 10 p. 1518-1521, 2005