Dravite and Annabergite Physical Properties

Dravite

Annabergite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.03-3.183.07

1 7.18

1.5 Fracture

Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

{???} Indistinct

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

1.7 Mohs Hardness

7-7.52

2 10

1.8 Chemical Composition

Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

Ni3(AsO4)2•8(H2O)

Dravite and Annabergite Chemical Formula

While comparing Dravite and Annabergite 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 Dravite and Annabergite chemical formula.

Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)

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Dravite and Annabergite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dravite and Annabergite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Annabergite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 3.07 whereas that of Annabergite is 3.07.