Formula: FeNi

Origin of name: From tetragonal and taenite

Crystal system: Tetragonal

Crystal class: 4/m 2/m 2/m

Twinning:

Unit cell: a = 2.533, c = 3.582

Colour: Silver-white to grayish white

Diaphaneity: Opaque

Luster: Metallic

Habit: Small grains 5 to 50 micron, rare to 400 micron, as rims around taenite

Hardness: 3.5

Specific gravity: 8.275

Cleavage: none

Tenacity: Malleable

Streak: Gray

Synonyms/varieties:

Comments: from meteorites only. Magnetic