Rhomboclase is an acidic iron sulfate mineral with a formula reported as H5Fe3+O2(SO4)2·2(H2O)[3] or HFe(SO4)2·4(H2O).[1] It crystallizes in the orthorhombic system and typically occurs as tabular crystals with a rhombic outline.[3] It occurs as transparent colorless, blue, green, yellow or grey crystals with a vitreous to pearly luster.[2]
Rhomboclase forms within the oxidizing environment of pyrite rich ore deposits and is reported as a post mine mineral of arid regions.[3]
It was first described in 1888 for an occurrence in Slovakia and was named from Latin, rhombus, rhomb, and Greek klasis, to break, for its crystal form and perfect basal cleavage.
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