Formula: PbO simple oxide, dimorph of litharge
Specific gravity: 9.56
Hardness: 2
Streak: yellow
Colour: Yellow, sometimes with a reddish tint. Nearly colourless to pale yellow in transmitted light.

Hydrothermal environments
Volcanic sublimates

Massicot is a rare mineral of secondary origin associated with galena and dimorphous 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. It is associated with cerussite, litharge, minium, wulfenite, antimony oxides and limonite.

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