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Jurbanite (field of view: 5 mm)
Category Sulfate minerals
(repeating unit)
Strunz classification 7.DB.15
Dana classification
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group P21/n
Color Colorless
Crystal habit Small crystals and stalactitic forms
Tenacity Brittle
Mohs scale hardness 2.5
Luster Vitreous
Diaphaneity Transparent
Specific gravity 1.786
Optical properties Biaxial (-)
Refractive index nα = 1.459 nβ = 1.473 nγ = 1.483
Birefringence δ = 0.024
2V angle Measured: 80°
Solubility Soluble in water
References [1][2][3]

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 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]