Chromferide

Formula:  Fe₃Cr_1-x   (x = 0.6)

Origin of name:  From Chromium and iron (Latin ferrum)

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell: a = 2.859 Å

Colour:  Light grey

Diaphaneity:  Opaque

Luster:  Metallic

Habit:  Small grains of sub-micrometer size and aggregates to hundreds of micrometers

Hardness:  4

Specific gravity:  6.69

Cleavage:  None

Tenacity:

Streak:

Synonyms/varieties:

Comments: Ferromagnetic. Found in quartz veins within brecciated amphibolites and schist