Goethite and Fluorite Physical Properties

Goethite

Fluorite

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Physical Properties

Tenacity

Brittle

Solubility

HCl soluble

slightly water soluble and in hot hydrochloric acid

Durability

Specific Gravity

4.27-4.293.00-3.25

1 7.18

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Fracture

Uneven

Subconchoidal, Uneven, ConchoidalWalter Schumann

Cleavage

Perfect {010}

Octahedral, perfect on {111}, parting on {011}

Mohs Hardness

5-5.54

2 10

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Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

CaF₂

Goethite and Fluorite Chemical Formula

While comparing Goethite and Fluorite 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 Fluorite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Fluorite- CaF₂

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Goethite and Fluorite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Fluorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Fluorite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 3.00-3.25 whereas that of Fluorite is 3.00-3.25.