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Tsilaisite

Year of discovery: 2011 (Grotta d'Oggi, Italy), 2017 (Japan)

Locality list: A locality of tsilaisite

• NaMn₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
• [Na⁺][Mn²⁺₃][Al³⁺₆][(OH)₃|OH|(BO₃)₃|(SiO₃)₆]^25-

• Class: Alkali-subgroup 1 < Alkali-tourmaline group < Tourmaline supergroup
• Class: Cyclosilicate (Single ring) - Borate - Hydroxide

• Mn => Fe: Schorl
• Mn => Mg: Dravite

• Mn₂ => LiAl: Elbaite

• OH => F: Fluor-tsilaisite

• NaMn₃ => LiAl₂: Rossmanite

• Color: Greenish yellow
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Hardness: 7

• System: Trigonal
• Group: 3m, R3m
• Lattice: a=15.9, c=7.1