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Hörnesite (Photo), Hornesite

Year of discovery: 1895 (Ciclova, Romania), 1988 (Japan)

Locality list: A locality of hörnesite

• Mg₃(AsO₄)₂,8H₂O
• [Mg²⁺₃][(AsO₄)₂]^6-,8H₂O

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

• Mg => Ni: Annabergite (Series)
• Mg => Zn: Köttigite (Kottigite), Metaköttigite (Metakottigite)
• Mg => Co: Erythrite (Series)
• Mg => Fe: Symplesite, Parasymplesite
• Mg => Mn: Manganohörnesite, Manganohornesite

• AsO₄ => PO₄: Baricite

• Color: White
• Streak: White
• Luster: Pearly
• Diaphaneity: Transparent

• Cleavage: Perfect on {010} (1 plane), Poor on {100} (1 plane)
• Hardness: 1
• Density: 2.6

• System: Monoclinic
• Group: 2/m, I2/m
• Lattice: a=10.3, b=13.4, c=4.7, β=104.9