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Chalcomenite

Year of discovery: 1881 (Cerro de Cacheuta, Argentina), 2012 (Japan)

Locality list: A locality of chalcomenite

• CuSeO₃,2H₂O
• [Cu²⁺][SeO₃]^2-,2H₂O

• Class: Selenite - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄

• Polymorph: Clinochalcomenite (Monoclinic)

• Cu => Ni: Ahlfeldite
• Cu => Co: Cobaltomenite

• SeO₃ => TeO₃: Teineite

• Color: Blue
• Streak: Pale blue
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: No
• Hardness: 2-2.5
• Density: 3.4

• System: Orthorhombic
• Group: 222, P2₁2₁2₁
• Lattice: a=6.7, b=9.2, c=7.4