Goethite

General

Category: Oxide minerals

Formula (repeating unit): α-FeO(OH)

Strunz classification: 04.FD.10

Identification

Color: Yellowish to reddish to dark brown

Crystal system: Orthorhombic 2/m2/m2/m

Cleavage: Perfect 010

Fracture: Uneven to splintery

Mohs scale hardness: 5 - 5.5

Luster: Adamantine to dull

Streak: Brown, brownish yellow to orange yellow

Specific gravity: 3.3 - 4.3

Refractive index: Opaque to sub-translucent

Fusibility: Fusible at 5 - 5.5

Other characteristics: Becomes magnetic in reducing flame



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