Formula: Mg0.5ZnFe3+(Te4+O3)3.nH2O (3 ≤ n ≤ 4.5)
Specific gravity: 4.05
Hardness: Quite soft
Colour: Light brown, dark brown
At the type locality, the Moctezuma Mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico, zemannite is a rare secondary mineral in the oxidised zone of a hydrothermal gold-tellurium deposit, occurring as crystals usually less than 1 mm long. Associated minerals include tellurium, tellurite, paratellurite, spiroffite, mroseite, moctezumite, denningite and burckhardtite (CM 14.387-390, HOM, Dana).
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