A sulphate of ferrous and ferric iron. Probably a mixture of Melanterite and Rhomboclase.
Originally reported from La Bourboule, Monts-Dore Massif, Puy-de-Dôme, Auvergne, France.
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(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.