Dravite and Goethite Physical Properties

Dravite

Goethite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

HCl soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.03-3.184.27-4.29

1 7.18

1.5 Fracture

Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).

1.6 Cleavage

{???} Indistinct

Perfect {010}

1.7 Mohs Hardness

7-7.55-5.5

2 10

1.8 Chemical Composition

Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

FeO(OH)Arthur Thomas , Gemstones (2009)

Dravite and Goethite Chemical Formula

While comparing Dravite and Goethite 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 Dravite and Goethite chemical formula.

Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)

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Dravite and Goethite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dravite and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Goethite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 4.27-4.29 whereas that of Goethite is 4.27-4.29.