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Köttigite, Kottigite

Year of discovery: 1850 (St Daniel mine, Germany), 1986 (Japan)

Locality list: A locality of köttigite

• Zn₃(AsO₄)₂,8H₂O
• [Zn²⁺₃][(AsO₄)₂]^6-,8H₂O

• Class: Vivianite group
• Class: Arsenate - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄

• Polymorph: Metaköttigite (Metakottigite) (Triclinic)

• Zn => Ni: Annabergite (Series)
• Zn => Co: Erythrite (Series)
• Zn => Mg: Hörnesite (Hornesite)
• Zn => Fe: Parasymplesite (Series), Symplesite
• Zn => Mn: Manganohörnesite, Manganohornesite

• Color: Colorless, Red, Yellow
• Streak: Pale red
• Luster: Resinous
• Diaphaneity: Translucent

• Habit: Prismatic

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 2.5-3
• Density: 3.3

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=10.2, b=13.4, c=4.8, β=105.2