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Prismatine

Year of discovery: 1886 (Waldheim, Germany), 1944 (Japan)

Locality list: A locality of prismatine

• Mg₅Al₄BSi₄O₂₁(OH)
• (Mg,Fe,Al)₅Al₄(Si,Al,B)₅O₂₁(OH,F)
• [][Mg²⁺₅][Al³⁺₄][OH|O₄|Si₂O₇|BSi₂O₁₀]

• Class: Kornerupine group
• Class: Sorosilicate - Oxide - Hydroxide

• Mg₂B => Al₂Si: Kornerupine (Series)

• Color: Grayish brown, Green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {110} (2 planes)
• Hardness: 6.5-7
• Density: 3.3

• System: Orthorhombic
• Group: mmm, Cmcm
• Lattice: a=15.9, b=13.7, c=6.7