Bernarlottiite
Bernarlottiite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Pb₁₂(As₁₀Sb₆)S₃₆.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: specific gravity 5.601; Black streak; Metallic. Anisotropism: Distinct to strong in grayish to bluish tints. Bireflectance: Distinct. Pleochrism: Weak luster.
IMA symbol Bl, IMA status: approved, named in 2013.
Of hydrothermal origin in cavities, to 30 cm, in marble related to tectonometamorphism.
It is found associated with Sb-rich sartorite.
The mineral was named to honor Bernardino Lotti (1847-1933) for his significant contributions to the knowledge of the geology of Tuscany and to the development of the Tuscan mining industry.
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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