Tooeleite

Formula: Fe_8-2x[(As_1-xS_x)O₄]₆.5H₂O

Origin of name: after locality Tooele County, Utah, U.S.A.

Crystal system: Orthorhombic

Crystal class: mm2 or 2/m 2/m 2/m (probable)

Twinning:

Unit cell: a = 6.416, b = 19.45, c = 8.941

Colour: Cadmium orange, may be brownish orange or yellowish orange

Diaphaneity: Transparent

Luster: Greasy

Habit: Bladed crystals to 10 mm, usually in compact crystalline crusts

Hardness: 3

Specific gravity: 4.23

Cleavage: 1; {010} good

Tenacity: 

Streak: Cadmium-orange

Synonyms/varieties:

Comments:  Occurs in voids in massive scorodite