Chemical formula: 2MnO x SiO2
Melting point: 1345oC
Density: 4.04 g/cm3
Microhardnes: 950 kp/mm2
Hardness (Moh's): 6.5
Luminescence: Non-fluorescent
Colour in air, bright field reflection: Grey
Colour, polarized reflection: No data
Shape: No data
Crystal system: Orthorhombic
Cell dimensions: a=4.76 A, b=10.2 A, c=5.98 A
PDF number: 00-002-1326
ICSD number: 100433
Note: No iclusions with pure tephroite have been found. In synthetic slags, the tephroite phase often forms a characteristic banded structure (Kiessling and Lange, 1964).

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