Chengdeite

Formula:  Ir₃Fe

Origin of name:  After locality; Chengde Co., China

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell:

Colour:  Steel-black

Diaphaneity:  Opaque

Luster:  Metallic

Habit:  Grains to 0.5mm

Hardness:  5

Specific gravity:  19.19

Cleavage:

Tenacity:

Streak:  Black

Synonyms/varieties:

Comments:  Ir analogue of isoferroplatinum; strongly magnetic