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Arsenic (Photo)

Year of discovery: before 1959 (World), 1893 (Japan)

Locality list: 24 localities of arsenic

• As
• (As,Sb)

• Class: Arsenic group
• Class: Native elements
• Soluble in: HCl
• Surface turns black by oxidization under ambient condition.

• Polymorph: Arsenolamprite (Orthorhombic), Pararsenolamprite (Orthorhombic)

• As => Sb: Antimony (Series)
• As => SbAs: Stibarsen

• Color: Silver white
• Tarnish: Dark gray-Black, Dull luster (Readily in the air)
• Streak: Gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Powder, Prismatic, Acicular
• Twin: {10-14}

• Cleavage: Perfect on {0001} (1 plane), Distinct on {1014} (3 planes)
• Hardness: 3.5
• Density: 5.7

• System: Hexagonal
• Group: (-3)m, R(-3)m
• Lattice: a=3.8, c=10.6

Etymology: Arsen (man) in Greek

Synonym: Native arsenic