|CERUSSITE MINERAL FACTS|
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.Cerussite Mineral Facts:
Chemical Formula: PbCO3
Colors: Colorless to white, but also gray when discolored by decomposition products.
Hardness: 3.0 to 3.5
Cleavage: Distinct in two directions.
Luster:. Adamantine to vitreous. Can range from fully transparent to almost opaque.
(Refractive Index): a = 1.803; b = 2.07; y = 2.078
Identification and Diagnostics
It is easily fusible (1.5). With sodium carbonate bead on charcoal gives globule of lead and yellow to white coating of lead oxide. Soluble in warm dilute nitric acid with effervescence. In the closed tube it usually decrepitates and is changed to lead oxide, which is dark yellow when hot. Recognized by its high specific gravity, white color and adamantine luster.
Localities and Origins:
Cerussite crystals of great beauty are found in many of the lead-producing districts of Europe and also at Phoenixville, Penn.; near Union Bridge, in Maryland; at Austin's Mines, Wythe Co., Virginia, and occasionally in the lead mines of Wisconsin and Missouri. In the West it occurs at Leadville, Colo.; at the Flagstaff and other mines in Utah (Fig. 123), and at several different mines in Arizona.
Notable worldwide localities for its occurrence are Ems in Nassau; Mies, Bohemia; Nerchinsk, Siberia; Broken Hill, New South Wales; various districts in Mexico, etc.
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Please note that the author, Chris Ralph, retains all copyrights to this entire document and it may not be reproduced, quoted or copied without permission.
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