"Formula:(Fe,Mg,Al)6(Si,Al)4O10(OH)8
Non-approved member of the Chlorite Group. An iron-rich chlorite equivalent to chamosite.
Originally reported from Gelegenheit Mine, Weilburg, Wetzlar, Hesse, Germany." - https://www.mindat.org/min-278.html, 22.12.2021
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