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Magnesiostaurolite [abbr. Mst ]

Year of discovery: 1992 (Gilba valley, Italy), 1987 (Japan)

Locality list: 2 localities of magnesiostaurolite

• Mg_1.5Al₉Si₄O₂₂(OH)₂
• (Mg,Li,Fe)_1.5-2Al₉(Si,Al)₄O₂₂(O,OH)₂
• [Mg²⁺_1.5][Al³⁺₉][O₆|(OH)₂|(SiO₄)₄]^24-

• Class: Nesosilicate - Oxide - Hydroxide

• Mg => Fe: Staurolite
• Mg => Zn: Zincostaurolite

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

• Hardness: 7-7.5
• Density: 3.5

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=7.9, b=16.5, c=5.6, β=90.0