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Pentahydroborite

Year of discovery: 1962 (Novofrolovskoye B deposit, Russia), 1982 (Japan)

Locality list: A locality of pentahydroborite

• CaB₂O(OH)₆,2H₂O
• [Ca²⁺][H₆B₂O₇]^2-,2H₂O

• Class: Soro-Borate - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄
• Fluorescence: Short UV excitation (Purple)

• Color: Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: No
• Hardness: 2.5
• Density: 2.0

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.8, b=6.5, c=8.1, α=111.6, β=111.9, γ=73.4