Mineralpedia Details for Arsenic
Named for the Latin word for the element arsenicum, and earlier for the Greek arsenikos, meaning “male,” in reference to Arsenic’s potent properties. Arsenic is uncommon, but with a number of localities including in Germany, France, the Czech Republic, Romania, the United States, Peru, Borneo, Japan, and China, for localities of some interest. Arsenic forms in hydrothermal veins and in deposits that contain other arsenic minerals, and cam occasionally be found in cobalt-silver sulfide veins.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/arsenic.pdf
Arsenic from Kusa mine, near Bau, Borneo, Malaysia
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Crusty gray botryoidal Arsenic with thin concentric layers visible in the cross sections of the botryoids.
Arsenic from Pribram, Bohemia, Czech Republic
Compact, dull grey, reniform Arsenic. This is a large than usual specimen relative to most localities.