Tellurite, spiroffite group, manganese-bearing mineral
Specific gravity: 5.01
Colour: Purplish red to pink
Solubility: Readily soluble in hydrochloric acid, insoluble in hot nitric or sulphuric acid
Spiroffite is a rare secondary mineral found in oxidised,
telluride-bearing rocks (Webmin).
At the type locality, the Moctezuma Mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico, spiroffite is a very rare mineral in the oxidised zone of a gold-tellurium deposit in a quartz matrix. Associated minerals include tellurium, tellurite, paratellurite, denningite, mroseite and zemannite (AM 47.196, HOM, Dana).
At the Joe Mine, Tombstone Mining District, Cochise County, Arizona, USA, spiroffite occurs very rarely in intensely silicified pyritic shale (HOM).
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