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Formula: PbO simple oxide, paramorph of
litharge
Crystal System: Orthorhombic
Specific gravity: 9.56 measured, 9.64 calculated
Hardness: 2
Streak: yellow
Colour: Yellow, sometimes with a reddish tint. Nearly colourless to pale yellow in transmitted light.
Environments:
Hydrothermal environments
Volcanic sublimates
Massicot is a rare mineral of secondary origin associated with
galena and paramorphous with
litharge. It may be an oxidation product of
galena, bournonite,
boulangerite or other lead-bearing
minerals and it is also found as a sublimation product in fumeroles (Dana).
It is associated with cerussite, litharge,
minium, wulfenite,
antimony oxides and
limonite
(HOM).
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