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Boracite

• Mg₃B₇O₁₃Cl
• [Mg²⁺₃][Cl|B³⁺₇O₁₃]^6-

• Class: Tecto-Borate - Chloride
• Soluble in: Water (Decompose very slowly), HCl (Slowly)
• Electrical: Piezoelectric, Pyroelectric
• Substitution pseudomorph: Replace Quartz.

• Polymorph: Trembathite (Trigonal

• Mg => Fe: Ericaite (Series)
• Mg => (Fe,Mg): Congolite
• Mg => Mn: Chambersite

• Color: Green,Blue,Colorless,Gray
• Streak: White
• Luster: Vitreous-Adamandine
• Diaphaneity: Transparent-Translucent

• Cleavage: No
• Hardness: 7-7.5
• Density: 2.9

• System: Orthorhombic
• Group: mm2, Pca2₁
• Lattice: a=8.6, b=8.6, c=12.1