Specific gravity: 6.57
Streak: Light yellow
Colour: Bright sulphur yellow
Cliffordite occurs as rare incrustations along fractures in the oxidised zone of hydrothermal
gold-silver telluride deposits
At the Moctezuma mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico, cliffordite is associated with tellurium, paratellurite and quartz (HOM).
At the type locality, the San Miguel Mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico, cliffordite occurs in an environment of andesite porphyrys and altered tuffs. Quartz veins cutting these rocks sometimes contain substantial amounts of baryte and pyrite, and locally may be mineralised with native tellurium and other tellurides including gold and silver minerals. Oxidation of these veins has given rise to a number of oxidised tellurium minerals, especially mackayite, besides abundant jarosite and limonite and other iron oxides coating fractures. Minerals recognised in very minor amounts include tetrahedrite, rickardite, emmonsite, tellurite, schmitterite, cliffordite and chlorargyrite. The cliffordite is rare and occurs typically on oxidised joint surfaces in druses and scattered about between larger mackayite crystals which are thickly disseminated on the same surfaces. The crystals are always small, up to about 0.2 mm (AM 54.697-701).
At the San Miguel prospect, Moctezuma, Moctezuma Municipality, Sonora, Mexico, cliffordite is associated with mackayite, baryte, quartz and limonite (HOM).
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