Bustamite and Austinite Physical Properties

Bustamite

Austinite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partly soluble in HCl.

Easily soluble in cold dilute HCl

1.3 Durability

Not Available

1.4 Specific Gravity

3.32-3.434.12

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

{100} perfect; {110} and {1 1 0} good; {010} poor

Good in two directions parallel to the prism faces {110}

1.7 Mohs Hardness

5.5-64-4.5

2 10

1.8 Chemical Composition

(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

CaZn(AsO4)(OH)

Bustamite and Austinite Chemical Formula

While comparing Bustamite and Austinite 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 Bustamite and Austinite chemical formula.

Chemical formula of Bustamite- (Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Austinite- CaZn(AsO4)(OH)

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Bustamite and Austinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Bustamite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Bustamite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Bustamite is 4.12 whereas that of Austinite is 4.12.