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Minerals - Goethite | TerraCollect

Mineral - Goethite

GoethiteFe³⁺O(OH)

Chemical Properties

Mineral Class

Oxides and Hydrxides

Toxicity

none

Formula

Fe³⁺O(OH)

Unit Cell

a=4.61 b=9.96 c=3.02 Z=4

Physical Properties

Hardness

5 - 5.5

Streak

brownyellowyellow brown

Optical Properties

Color

brownyellow

Birefringence

0.134

Luster

Metallic,

Silky,

Adamantine

Transparency

opaque

Pleochroism

Gelb/Braun

Geomineralogical Properties

Crystal System

orthorhombic

Composition

Elements

Mass

SiO₂

0.36

Fe₂O₃

89.65

H₂O

10.19

Colorado (Palache et al. 1952)

Groups and Members

Diaspore-Group

Karten-Ebenen

Geologische KarteSatelliten Karte

Density

Heavy (3,5-6)

Cleavage

Perfect after {010}

Fracture

uneven

Tenacity

Brittle

Point Group

orthorhombic-dipyramidal - 2/m 2/m 2/m

Space Group

Pnma (62)

Habit

dendritic, coarse, bulbous, crusty, massive, acicular, kidney-shaped, prismatic, radial, stalactitic, radial, grape-shaped

Formation

Oxidation zone of iron deposits

Paragenesis

Twinning

Rarity

Very common

Synonyms

Goethite