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Hercynite
Chemical formula: FeO x Al2O3
Melting point: 1780oC
Density: 4.05 g/cm3
Microhardnes: No data
Hardness (Moh's): 7.5
Luminescence: Non-fluorescent
Crystal system: Cubic
Cell dimensions: a=8.119 A
PDF number: 00-003-0894
ICSD number: 074611
Note: In synthetic slag, hercynite usually has a crystallization pattern similar to galaxite. Only one example of steel inclusions with hercynite was found (Kiessling and Lange, 1964).