Rozenite information

Rozenite
Rozenite
	Rozenite from Morocco
General
Category	Sulfate mineral
Formula; (repeating unit)	Fe2+SO4·4(H2O)
IMA symbol	Rzn
Strunz classification	7.CB.15
Dana classification	29.06.06.01
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) ; (same H-M symbol)
Space group	P21/n
Identification
Color	Colorless, white, pale green
Crystal habit	As concretions and nodules; most commonly as powdery efflorescences or coatings on melanterite
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

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]

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

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.

[Handbook-2] Rozenite in the Handbook of Mineralogy

[Mindat-3] Rozenite data on Mindat.org

[Webmin-4] Webmineral data for rozenite

[5] "Scientific article rozenite" (PDF).

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