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Mullite
Chemical formula: 3Al2O3 x 2SiO2
Melting point: 1850oC
Density: 3.156 g/cm3
Microhardnes: 1500 kp/mm2
Hardness (Moh's): 6-7
Luminescence: Mullite often shows a blue-white fluorescence in EPMA.
Crystal system: Orthorhombic
Cell dimensions: a=14.88 A, b=15.18 A, c=5.75 A
PDF number: 00-006-0258
ICSD number: 066451
Note: In the metallographic samples of steel inclusions with mullite the phase is usually found as chracteristic rombic or rhomohedral crystals, often with a galssy residue in their centres.