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Coalingite (Photo)

Year of discovery: 1965 (New Idria deposit, USA), 1975 (Japan)

Locality list: 12 localities of coalingite

• Mg₁₀Fe³⁺₂(CO₃)(OH)₂₄,2H₂O
• [Mg²⁺₁₀][Fe³⁺₂][(OH)₂₄|CO₃],2H₂O

• Class: Hydrotalcite supergroup
• Class: Carbonate - Hydroxide

• Color: Reddish brown
• Streak: Pale brown
• Luster: Resinous
• Diaphaneity: Translucent

• Habit: Platy

• Cleavage: Good (1 plane)
• Hardness: 1-2
• Density: 2.3

• System: Trigonal
• Group: (-3)m, R(-3)c
• Lattice: a=3.1, c=37.4