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Plancheite

Year of discovery: 1908 (Sanda quarry, Congo), 1973 (Japan)

Locality list: A locality of plancheite

• Cu₈Si₈O₂₂(OH)₄,H₂O
• [Cu²⁺₈][(OH)₄|(Si₄O₁₁)₂]^16-,H₂O

• Class: Plancheite group
• Class: Inosilicate (Double chain) - Hydroxide - Hydrate

• Color: Blue, Greenish blue
• Streak: Pale blue
• Luster: Silky
• Diaphaneity: Translucent

• Hardness: 6
• Density: 3.7

• System: Orthorhombic
• Group: mmm, Pcnb
• Lattice: a=19.0, b=20.1, c=5.3

Synonym: Planchéite