Hawthorneite

Formula:  Ba(Ti₃Cr₄Fe₂Fe₂Mg)O₁₉

Origin of name:   For John Hawthorne, South African geologist

Crystal system:  Hexagonal

Crystal class:  6/m 2/m 2/m

Twinning: 

Unit cell: 

Colour:  Black

Diaphaneity:  Opaque

Luster:  Metallic

Habit:  Irregular grains 50-100 µm

Hardness:  5.8

Specific gravity: 

Cleavage:  None

Tenacity:

Streak: 

Synonyms/varieties:

Comments:  Known from one sample as seen in polished section