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Borcarite

Year of discovery: 1965 (Titovskoe B deposit, Russia), 1997 (Japan)

Locality list: A locality of borcarite

• Ca₄MgB₄O₆(CO₃)₂(OH)₆
• [Ca²⁺₄][Mg²⁺][(CO₃)₂|(H₃B₂O₆)₂]^10-

• Class: Soroborate (Tetrahedron) - Carbonate

• Mg => Cu: Numanoite

• Color: Bluish green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Opaque

• Cleavage: Perfect on {100} and {110} (2 planes)
• Hardness: 4
• Density: 2.8

• System: Monoclinic, Triclinic?
• Group: 2/m, C2/m
• Lattice: a=17.8, b=8.4, c=4.4, β=102.0