Specific gravity: 6.916 calculated
Colour: Very pale straw yellow, colourless to pale yellow
Schmitterite is a secondary mineral in the oxidised portions of a
At Shinkolobwe, Katanga Province, Congo, schmitterite is associated with uraninite, siegenite and vaesite (HOM).
At the type locality, the Moctezuma Mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico, schmitterite was found sparingly scattered on emmonsite, or on limonite surfaces adjacent to emmonsite encrustations, as single crystals or grains, or more commonly as small rosettes to 1 mm in diameter. Less commonly schmitterite was found scattered on quartz fracture surfaces with crusts of small crystals of moctezumite, sometimes pseudormorphously replacing the latter (AM 56.411-415). Associated minerals include emmonsite, mackayite, cuzticite, eztlite and limonite (HOM).
At the San Miguel prospect, 10 km northwest of the Moctezuma mine, Sonora, Mexico, only one specimen collected showed schmitterite, which was thickly scattered on a druse of mackayite crystals (AM 56.411-415).
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