Chemical formula: 3MnO x Al2O3 x 3SiO2
Melting point: 1195oC
Density: 4.18 g/cm3
Microhardnes: 1000-1100 kp/mm2
Hardness (Moh's): 6.5-7.5
Luminescence: Non-fluorescent
Colour in air, bright field reflection: Red to yellowish brown
Colour, polarized reflection: No data
Shape: No data
Crystal system: Cubic
Cell dimensions: a=11.621 A
PDF number: Data not found
ICSD number: Data not found
Note: Spessartite forms a featherlike, branched structure in microsections of inclusions. It crystallizes slowly and has the lowest melting point of the differebt phase in the MnO-SiO2-AL2O3 system. This phase was only observed in those steel inclusions which had been hot worked or cooled slowly. If steel samples with inclusions having a glassy.

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