Goethite and Pargasite Physical Properties

Goethite

Pargasite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

HCl soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.293.04-3.26

1 7.18

1.5 Fracture

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

Splintery, Brittle, Uneven

1.6 Cleavage

Perfect {010}

{110} perfect

1.7 Mohs Hardness

5-5.55-6

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Goethite and Pargasite Chemical Formula

While comparing Goethite and Pargasite 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 Pargasite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Pargasite- NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Goethite and Pargasite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Pargasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Pargasite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 3.04-3.26 whereas that of Pargasite is 3.04-3.26.