Pseudorutile

Formula: Fe₂Ti₃O₉

Origin of name: from Greek pseudo = false and rutile

Crystal system: hexagonal

Crystal class: 622

Twinning: 

Unit cell: 

Colour: light brown to black, red, gray

Diaphaneity: opaque, transparent in thin fragments

Luster: submetallic to waxy

Habit: fine-grained alteration product of rutile

Hardness: 3.5

Specific gravity: 3.8 to 4.13

Cleavage: none

Tenacity: 

Streak: reddish brown

Synonyms/varieties:

Comments: magnetic, once discredited, now reinstated