Massicot
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Massicot is a natural mineral form of lead(II) oxide, PbO. Massicot is the orthorhombic dimorph of the tetragonal form of lead oxide, litharge. It forms soft (Mohs hardness of 2) yellow to reddish-yellow earthy scaley masses which are very dense, with a specific gravity of 9.64.
It was first described in 1841 for an occurrence in Stolberg, near Aachen, Germany. The name is French for lead oxide.
[edit] References
- Palache, C., H. Berman, and C. Frondel (1944) Dana’s system of mineralogy, (7th edition), v. I, 516–517
- Webmineral data
- Mindat with location data
- Mineral data publishing - PDF
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