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Formula: PbSe4+O3
Selenite of lead
Crystal System: Monoclinic
Specific gravity: 7.07 measured, 7.12 calculated
Hardness: 3½
Streak: White
Colour: Colourless to white, yellowish white
Environments
Molybdomenite is a rare species that occurs in the oxidised zone of
selenium-bearing hydrothermal base metal deposits
(HOM0.
Localities
At the type locality, the Cacheuta mine, Cerro de Cacheuta, Sierra de Cacheuta, Cacheuta District, Luján de Cuyo
department, Mendoza Province, Argentina, molybdomenite occurs in the oxidised zone of
selenium-bearing hydrothermal base metal deposits, associated with
chalcomenite
(Mindat). It is an alteration product of clausthalite
(Webmin).
At the El Dragón mine, Porco Municipality, Antonio Quijarro Province, Potosí, Bolivia, molybdomenite is
associated with chalcomenite,
cobaltomenite, schmiederite,
krut'aite and
alfredopetrovite
(HOM, EJM 28.2.479–484).
At the Ranwick Mine, Peever Township, Algoma District, Ontario, Canada, molybdomenite occurs as small white to
colourless blades closely associated with clausthalite. Other minerals
reported from this mine include pitchblende,
calcite, hematite,
klockmannite, native selenium,
and malachite
(CM 8.149-158).
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