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A silvery grey semi-metal which tarnishes in air and is highly toxic. It also exists as a yellow allotrope.
 Crystals under argon Crystals under argon.
These lovely arsenic crystals make clear that arsenic really is a metal, even though most people think of it as a classic poison powder. It tarnishes rapidly in air so these crystals have been preserved by sealing them under dry argon gas.
Source: DePauw stocks
Size: 1/2"
Purity: 99.9%
 Stibarsen Stibarsen.
Formerly referred to as allemontite, stibarsen is a rare intermetallic alloy of antimony (stibium) and arsenic. It is tin white in color, tarnishing to dark gray to black on exposure to air. It rarely forms crystals, usually occurring in massive or reniform habits
Source: Mackay mineral collection
Size: 1.5"
Purity: 38%
 Native Arsenic with Proustile Native Arsenic with Proustile.
Freshly exposed native arsenic is tin white in color, rapidly tarnishing to black on exposure to air. As with stibarsen, crystals are rare with massive, nodular or reniform habits being the usual forms. Proustite (Ag3AsS3) is a sulfide of silver and arsenic with a high silver content (65.41%), usually found in association with arsenic ores. It is vermilion in color but darkens on exposure to light due to the formation of a thin surface layer of metallic silver.
Source: Mackay mineral collection
Size: 1.5"
Purity: >95%
 Realgar Realgar.
Realgar, derived from the Arabic rahj al ghar (powder of the mine), is an arsenic ore known since ancient times and was once used as a pigment. It is translucent to transparent, bright red to orange red in color and occurs in ore veins with other arsenic, antimony or lead minerals as well as in volcanic and hydrothermal environments. Realgar is photosensitive, decomposing to arsenic trisulfide (yellow orpiment) on exposure to light.
Source: Mackay mineral collection
Size: 1.5"
Purity: 70%