Galena and Anhydrite Physical Properties

Galena

Anhydrite

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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

6.232.90-2.98

1 7.18

1.5 Fracture

Subconchoidal, Brittle, Metallic

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

1.6 Cleavage

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

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

1.7 Mohs Hardness

2.5-2.753.5

2 10

1.8 Chemical Composition

PbS

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

Galena and Anhydrite Chemical Formula

While comparing Galena and Anhydrite 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 Galena and Anhydrite chemical formula.

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

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Galena and Anhydrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Galena and Anhydrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Galena and Anhydrite Optical Properties during the identification of gemstone. Specific gravity of Galena is 2.90-2.98 whereas that of Anhydrite is 2.90-2.98.