rhomboclase


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rhomboclase

[′räm·bə‚klās]
(mineralogy)
HFe3+(SO4)2·4H2O A colorless mineral composed of hydrous acid ferric sulfate, occurring in rhombic plates.
References in periodicals archive ?
The presence of iron sulfates (probable rhomboclase) was suspected in a cm thick oxidized pyrite analyzed by EDS in SEM and Raman spectrometry.
In addition, rhomboclase was found as stalactitic clusters; all of these came from abandoned workings in the Alfredo pit of the Rio Tinto mine, Huelva province, Spain.
Slavikite has a sheet sulfate structure akin to that of some other ferric sulfates, such as jarosite, kornelite, and rhomboclase, with magnesium and sodium (or another cation?) in an interlayer position (Susse, 1975).