Xifengite

Formula: Fe₅Si₃

Origin of name: from Xifengkon, an eastern passageway of the Great Wall of China

Crystal system: Hexagonal

Crystal class: 6/m 2/m 2/m

Twinning:

Unit cell: a = 6.759, c = 4.72

Colour: Steel-gray

Diaphaneity: Opaque

Luster: Metallic

Habit: As cores in spheres, inclusions in other minerals

Hardness: 5.5

Specific gravity: 6.45

Cleavage: None

Tenacity: 

Streak: Black

Synonyms/varieties:

Comments: strongly magnetic