Annabergite and Anhydrite Physical Properties

Annabergite

Anhydrite

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1 Physical Properties

1.1 Tenacity

Sectile

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.072.90-2.98

1 7.18

1.5 Fracture

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

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

1.6 Cleavage

Perfect on {010}, indistinct on {100} and {102}

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

1.7 Mohs Hardness

23.5

2 10

1.8 Chemical Composition

Ni3(AsO4)2•8(H2O)

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

Annabergite and Anhydrite Chemical Formula

While comparing Annabergite 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 Annabergite and Anhydrite chemical formula.

Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)
Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Annabergite and Anhydrite Specific Gravity

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