Rhomboclase is an acidic iron sulfate mineral with a formula reported as H5Fe3+O2(SO4)2·2(H2O) or HFe(SO4)2·4(H2O). It crystallizes in the orthorhombic system and typically occurs as tabular crystals with a rhombic outline. It occurs as transparent colorless, blue, green, yellow or grey crystals with a vitreous to pearly luster.
- http://www.handbookofmineralogy.org/pdfs/rhomboclase.pdf Handbook of Mineralogy
- http://www.mindat.org/min-3410.html Mindat
- http://webmineral.com/data/Rhomboclase.shtml Webmineral data
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