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Adamite (Photo)

Year of discovery: 1866 (Chañarcillo, Chile), 1899 (Japan)

Locality list: 9 localities of adamite

• Zn₂AsO₄(OH)
• (Zn,Cu)₂AsO₄(OH)
• [Zn²⁺₂][OH|As⁵⁺O₄]^4-

• Class: Olivenite group
• Class: Arsenate - Hydroxide
• Soluble in: HCl, HNO₃
• Fluorescence: UV excitation (Green-Yellowish green)
• Variety: Cuprian adamite (+Cu, Green)

• Polymorph: Paradamite (Triclinic)

• Zn => Cu: Olivenite (Series)
• Zn₂ => CuZn: Zincolivenite (Series)

• [] => H₂O: Legrandite

• Color: White, Green, Yellow, Purple, Pink
• Streak: White
• Luster: Resinous
• Diaphaneity: Transparent

• Habit: Pyramidal, Acicular
• Aggregate: Radial, Reniform

• Cleavage: Distinct on {101} (2 planes), Indistinct on {010}
• Hardness: 3.5
• Density: 4.4

• System: Orthorhombic
• Group: mmm, Pnnm
• Lattice: a=8.3, b=8.5, c=6.0

Etymology: Gilbert-Joseph Adam (1795-1881), French mineralogist