Goethite and Lazurite Physical Properties

Goethite

Lazurite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

HCl soluble

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.292.75

1 7.18

1.5 Fracture

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

Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

Perfect {010}

Imperfect on {110}

1.7 Mohs Hardness

5-5.55.5

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Goethite and Lazurite Chemical Formula

While comparing Goethite and Lazurite 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 Lazurite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

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Goethite and Lazurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.75 whereas that of Lazurite is 2.75.