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Sapphirine
Chemical formula: 4MgO x 4Al2O3 x 2SiO2
Melting point: 1482oC
Density: 3.45 g/cm3
Microhardnes: No data
Hardness (Moh's): 7.5
Luminescence: Non-fluorescent
Crystal system: Monoclinic
Cell dimensions: a=9.72 A, b=14.58 A, c=10.07 A
PDF number: 00-011-0607
ICSD number: Data not found
Note: Sapphirine has not been observed in steel inclusions (Kiessling and Lange, 1964). It has been reported as a structural component of certain type of porcelain.