Jurbanite

Jurbanite is a sulfate mineral with the chemical formula AlSO4(OH)·5H2O. Its molecular weight is 230.13 g/mol. It crystallizes in the monoclinic system and is dimorphous with the orthorhombic mineral rostite.[1] Jurbanite occurs as a secondary (post-mine) mineral in mines containing sulfide minerals.[2]

Jurbanite
Jurbanite (field of view: 5 mm)
General
CategorySulfate minerals
Formula
(repeating unit)
AlSO4(OH)·5H2O
Strunz classification7.DB.15
Dana classification31.9.10.1
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/n
Identification
ColorColorless
Crystal habitSmall crystals and stalactitic forms
TenacityBrittle
Mohs scale hardness2.5
LusterVitreous
DiaphaneityTransparent
Specific gravity1.786
Optical propertiesBiaxial (-)
Refractive indexnα = 1.459 nβ = 1.473 nγ = 1.483
Birefringenceδ = 0.024
2V angleMeasured: 80°
SolubilitySoluble in water
References[1][2][3]

Jurbanite was first described for an occurrence in the San Manuel mine of Pinal County, Arizona and first described in 1976s. It was named for Joseph John Urban, the mineral collector who discovered it.[1]

References

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