Mineralpedia Details for Cesarolite
Named in honor of Giuseppe Raimondo Pio Cesaro, a Professor of Mineralogy and Crystallography at the University of Liege in Belgium. Cesarolite is a rare mineral that occurs in cavities in galena in localities in Tunisia, the United States, Japan, and Germany, among only a few others. Associated minerals in clued galena and coronadite. Cesarolite is commonly opaque and a steely-gray in color with a dull to submetallic luster.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/cesarolite.pdf
Cesarolite from Sidi Amor ben Salem mine, Tajerouine, Al Kef, Tunisia
Rounded masses to 6mm in Calcite matrix.
Dull black sub-metallic, rounded or botryoidal crystals to 2mm.