(K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,H2O]
Monoclinic
Illite, a potassium aluminum silicate hydroxide hydrate mineral of the clay group, occurs at Sterling Hill as 1-2 mm aggregates on weathered ore (J. L. Baum, personal communication). It has not been studied in detail and has not been reported from Franklin.
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