White crystals of the rare mineral plumbonacrite from Långban. — Photo: David Hospital · CC BY-SA 4.0
Plumbonacrite
Plumbonacrite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Pb₅(CO₃)₃O(OH)₂.
It crystallizes in the hexagonal crystal system (space group P6_3cm).
Key properties: specific gravity 7.07; Pearly luster.
IMA symbol Pncr, IMA status: approved, named in 1889.
Rare in the oxidized zone of hydrothermal polymetallic deposits.
It is found associated with Anglesite, linarite, galena (Tiger, Arizona, USA).
The name comes from the Latin for lead and the French nacre, for mother-of-pearl, in allusion to its composition and nacreous luster.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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