Arsenic
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Arsenic is a chemical element; it has the symbol As and atomic number 33. It is a metalloid and one of the pnictogens, and therefore shares many properties with its group 15 neighbors phosphorus and a
Arsen 1a
Gray arsenic nodule
A large sample of native arsenic from Sainte-Marie-aux-Mines, France
Realgar
Antimony
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Antimony is a chemical element with the symbol Sb and atomic number 51. A lustrous grey metal or metalloid, it occurs in nature mainly in the form of the sulfide mineral stibnite. Antimony compounds h
Arsenic
…As and atomic number 33. It is a metalloid and one of the pnictogens, and therefore shares many properties with its group 15 neighbors phosphorus and antimony. Arsenic is notoriously toxic. It occurs naturally in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal…
Antimony 4
Native antimony with oxidation products
Stibnite, China CM29287 Carnegie Museum of Natural History specimen on display in Hillman Hall of Minerals and Gems
The Italian metallurgist Vannoccio Biringuccio described a procedure to isolate antimony in 1540.