Anhydrite and Galena Physical Properties

Anhydrite

Galena

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.90-2.986.23

1 7.18

1.5 Fracture

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

Subconchoidal, Brittle, Metallic

1.6 Cleavage

Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.

Cubic perfect on [001], parting on [111]

1.7 Mohs Hardness

3.52.5-2.75

2 10

1.8 Chemical Composition

CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

PbS

Anhydrite and Galena Chemical Formula

While comparing Anhydrite and Galena 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 Anhydrite and Galena chemical formula.

Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Galena- PbS

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Anhydrite and Galena Specific Gravity

Another important criteria for qualitative analysis of gemstones is Anhydrite and Galena Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Anhydrite and Galena Optical Properties during the identification of gemstone. Specific gravity of Anhydrite is 6.23 whereas that of Galena is 6.23.