Bustamite and Lazurite Physical Properties

Bustamite

Lazurite

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Physical Properties

Tenacity

Brittle

Solubility

Partly soluble in HCl.

Soluble

Durability

Specific Gravity

3.32-3.432.75

1 7.18

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Fracture

Conchoidal

Uneven, Conchoidal

Cleavage

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

Imperfect on {110}

Mohs Hardness

5.5-65.5

2 10

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Chemical Composition

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

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Bustamite and Lazurite Chemical Formula

While comparing Bustamite and Lazurite 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 Lazurite chemical formula.

Chemical formula of Bustamite- (Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

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Bustamite and Lazurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Bustamite and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Bustamite and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Bustamite is 2.75 whereas that of Lazurite is 2.75.