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Mullite [abbr. Mul ]

Year of discovery: 1924 (Seabank Villa, UK), 1966 (Japan)

Locality list: 2 localities of mullite

• Al_4.8Si_1.2O_9.6
• Al₄(Si_2-2x,Al_2x)O_10-x
• [Al³⁺₄][O_10-x|((Si_1-x,Al_x)O₄)₂]^12-
• x=0.17-0.59

• Class: Nesosilicate - Oxide

• Color: Colorless, White, Pale yellow
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Distinct on {010} (1 plane)
• Hardness: 6-7
• Density: 3.1

• System: Orthorhombic
• Group: mmm, Pbam
• Lattice: a=7.6, b=7.7, c=2.9