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Annabergite (Photo)

Year of discovery: 1852 (Kippenhain mine, Germany), 1909 (Japan)

Locality list: 12 localities of annabergite

• Ni₃(AsO₄)₂,8H₂O
• [Ni²⁺₃][(AsO₄)₂]^6-,8H₂O
• [Ni(H₂O)₄]²⁺[Ni₂(H₂O)₄]⁴⁺[(AsO₄)₂]^6-

• Class: Vivianite group
• Class: Arsenate - Hydrate
• Soluble in: HCl

• Ni => Zn: Köttigite (Kottigite) (Series), Metaköttigite (Metakottigite)
• Ni => Fe²⁺: Parasymplesite, Symplesite
• Ni => Co²⁺: Erythrite (Series)
• Ni => Mg: Hörnesite (Hornesite) (Series)
• Ni => Mn: Manganohörnesite, Manganohornesite

• AsO₄ => PO₄: Arupite

• Color: Green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {010} (1 plane), Indistinct on {100} and {102} (2 planes)
• Hardness: 1.5-2.5
• Density: 3.1

• System: Monoclinic
• Group: 2/m, B2/m
• Lattice: a=10.2, b=13.3, c=4.7, β=104.8

Etymology: Annaberg district, Germany