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Alacránite, Alacranite

Year of discovery: 1985 (Alacrán mine, Chile, and Uzon Caldera, Russia), 2001 (Japan)

Locality list: 2 localities of alacránite

• As₄S₄, As₈S₉
• As₈(S,[])S₈
• β-[As₄][S₄], [As₈][[]|S₉]
• Regular alignment of arbitrary ratio of β-As₄S₄ and As₄S₅(Uzonite)

• Class: Realgar group
• Class: Sulfide

• Polymorph: Realgar (α, Monoclinic), Pararealgar (γ, Monoclinic)

• [] => S: Uzonite

• Color: Orange-Light gray
• Streak: Orange
• Luster: Greasy
• Diaphaneity: Transparent

• Habit: Platy, Prismatic along (100)
• Striation: Parallel to [100]
• Twin: (-101)

• Cleavage: Imperfect on {100} (1 plane)
• Hardness: 1.5
• Density: 3.4

• System: Monoclinic
• Group: 2/m, P2/c
• Lattice: a=9.9, b=9.6, c=9.2, β=101.9

Etymology: Alacran deposit, Canada