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Colemanite

• CaB₃O₄(OH)₃,H₂O
• [Ca²⁺][H₃B₃O₇]^2-,H₂O

• Class: Soro-Borate - Hydrate
• Soluble in: hot Water, hot HCl
• Insoluble in: Water
• Fluorescence: UV excitation (Yellow), Phosphorescence (Pale green)
• Electrical: Piezoelectric (Low-T), Pyroelectric (Low-T)
• Alter to Szaibélyite (Szaibelyite).
• Formed by alteration of Priceite.

• Color: Colorless, White
• Streak: White
• Luster: Adamantine
• Diaphaneity: Transparent-Translucent

• Habit: Pyramidal

• Cleavage: Perfect on {001} (1 plane), Distinct on {001} (1 plane)
• Hardness: 4.5
• Density: 2.4

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=8.7, b=11.3, c=6.1, β=110.1

Etymology: W.T. Coleman, father of boron industry in USA