Rozenite

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Rozenite
Rozenit, Maroko.jpg
General
Category Sulfate mineral
Formula
(repeating unit)
Fe2+SO4•4(H2O)
Strunz classification 07.CB.15
Dana classification 29.06.06.01
Identification
Color Colorless, white, pale green
Crystal habit As concretions and nodules; most commonly as powdery efflorescences or coatings on melanterite
Crystal system Monoclinic - prismatic H-M Symbol (2/m) Space Group: P 21/n
Mohs scale hardness 2 - 3
Luster Vitreous to dull
Streak White
Diaphaneity Semitransparent
Specific gravity 2.29
Optical properties Biaxial (-)
Refractive index nα = 1.526 - 1.528 nβ = 1.536 - 1.537 nγ = 1.541 - 1.545
Solubility Water soluble
References [1][2][3]

Rozenite is an uncommon hydrous iron sulfate mineral, Fe2+SO4•4(H2O).

It occurs as a secondary mineral, formed under low humidity at less than 21 °C as an alteration of copper-free melanterite which is a post mine alteration product of pyrite or marcasite. It also occurs in lacustrine sediments and coal seams. Associated minerals include melanterite, epsomite, jarosite, gypsum, sulfur, pyrite, marcasite and limonite.[1]

It was first described in 1960 for an occurrence on Ornak Mountain, Western Tatra Mountains, Małopolskie, Poland. It was named for Polish mineralogist Zygmunt Rozen (1874–1936).[1][2]

References[edit]