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Astrophyllite and Lapis lazuli Physical Properties


Lapis lazuli and Astrophyllite Physical Properties


Physical Properties

Tenacity
Not Available   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
3.2-3.4   
2.50-3.00   

Fracture
Uneven, Brittle, Metallic   
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)   

Cleavage
Perfect on [001] imperfect on [100]   
3,6   

Mohs Hardness
3   
5.5   

Chemical Composition
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)   
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4   

Optical Properties >>
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Astrophyllite and Lapis lazuli Chemical Formula

While comparing Astrophyllite and Lapis lazuli 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 Astrophyllite and Lapis lazuli chemical formula.

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Astrophyllite and Lapis lazuli Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Lapis lazuli Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Lapis lazuli Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.50-3.00 whereas that of Lapis lazuli is 2.50-3.00.

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