Goethite and Gedrite Physical Properties

Goethite

Gedrite

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Physical Properties

Tenacity

Solubility

HCl soluble

Durability

Specific Gravity

4.27-4.293.15-3.259

1 7.18

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Fracture

Uneven

Cleavage

Perfect {010}

Gedrite Magnesiogedrite , Comments: Dark gray cleavage fragment of magnesiogedrite (gedrite). , Location: Bamble, Telemark, Norway. , Scale: See Image.

Mohs Hardness

5-5.55.5-6

2 10

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Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

(Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)

Goethite and Gedrite Chemical Formula

While comparing Goethite and Gedrite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Goethite and Gedrite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Gedrite- (Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)

Compare Brown Gemstones

Goethite Vs Manganaxinite

Goethite Vs Mellite

Goethite Vs Povondraite

Goethite and Gedrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Gedrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Gedrite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 3.15-3.259 whereas that of Gedrite is 3.15-3.259.