trioxide upon heating in air. The processing of such minerals has led to numerous cases of poisonings, and after the mine is closed, the leftover trioxide waste will present environmental hazard (as was the case with the Giant Mine, for example). Only in China are arsenic ores intentionally mined.

In the laboratory, it is prepared by hydrolysis of arsenic trichloride:
:

occurs naturally as two minerals, arsenolite

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