Rozenite

Rozenite
Rozenite from Morocco
General
CategorySulfate mineral
Formula
(repeating unit)		Fe2+SO4·4(H2O)
IMA symbolRzn[1]
Strunz classification7.CB.15
Dana classification29.06.06.01
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/n
Identification
ColorColorless, white, pale green
Crystal habitAs concretions and nodules; most commonly as powdery efflorescences or coatings on melanterite
Mohs scale hardness2–3
LusterVitreous to dull
StreakWhite
DiaphaneitySemitransparent
Specific gravity2.29
Optical propertiesBiaxial (−)
Refractive indexnα = 1.526 – 1.528 nβ = 1.536 – 1.537 nγ = 1.541 – 1.545
SolubilityWater soluble
References[2][3][4]

Rozenite is a hydrous iron sulfate mineral, Fe2+SO4·4(H2O).

It occurs as a secondary mineral, formed under low humidity at less than 21 °C (70 °F) 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.[2]

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).[2][3]

The thermal expansion of rozenite was studied from −254 °C (−425.2 °F) to 17 °C (63 °F) using neutron diffraction. Rozenite exhibits negative linear thermal expansion, meaning that it expands in one direction upon cooling.[5]

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.
  2. ^ a b c Rozenite in the Handbook of Mineralogy
  3. ^ a b Rozenite data on Mindat.org
  4. ^ Webmineral data for rozenite
  5. ^ "Scientific article rozenite" (PDF).


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