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Olivenite (Photo)

Year of discovery: 1786 (Carharrack mine, UK), 1918 (Japan)

Locality list: 9 localities of olivenite

• Cu₂AsO₄(OH)
• [Cu²⁺₂][OH|AsO₄]^4-

• Class: Olivenite group
• Class: Arsenate - Hydroxide
• Variety: Leucochalcite (Acicular, White)
• Soluble in: HCl, HNO₃, H₂SO₄, NH₃aq

• Cu => Zn: Adamite (Series), Paradamite
• Cu => Mn: Eveite

• Cu₂ => CuZn: Zincolivenite (Series)

• AsO₄ => PO₄: Libethenite

• [] => H₂O: Strashimirite

• Color: Grayish green, Yellow, Brown
• Streak: Grayish green, Brown
• Luster: Adamantine
• Diaphaneity: Translucent-Opaque

• Habit: Acicular, Prismatic
• Aggregate: Filform

• Cleavage: Indistinct on {101} and {110}
• Hardness: 3
• Density: 4.5

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=8.6, b=8.2, c=5.9, β=90.1

Etymology: Olieve green color of this mineral.