Formula: Fe3Si
Origin of name: For Gupeikou, the eastern passageway of the Great Wall of China
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: Steel-gray
Diaphaneity: Opaque
Luster: Metallic
Habit:
Hardness: 5
Specific gravity: 7.15
Cleavage: None
Tenacity:
Streak: Black
Synonyms/varieties:
Comments: Strongly magnetic
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