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Spinel
Chemical formula: MgO x Al2O3
Melting point: 2135oC
Density: 3.58 g/cm3
Microhardnes: 2100-2400 kp/mm2
Hardness (Moh's): 8
Luminescence: Spinel shows a green fluorescence in EPMA.
Crystal system: Cubic
Cell dimensions: a=8.03 A
PDF number: 00-001-1154
ICSD number: 079000
Note: Spinel usually forms idomorphic, hard, characteristic crystals, easily identifiable in microstructure by their regular sections. Several examples of the spinel pahse in multiphase inclusions was found.