Alacránite

Alacránite (As8S9) is an arsenic first discovered in the Uzon , Kamchatka. It was named for its occurrence in the Alacrán mine. It is generally more rare than realgar. Its origin is hydrothermal to euhedral tabular orange to pale gray crystals that are transparent. It has a yellow-orange streak with a hardness of 1.5. It crystallizes in the monoclinic. It occurs with realgar and uzonite grains up to 0.5 mm across.