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Astrophyllite and Topaz Physical Properties


Topaz 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   
3.49-3.57   

Fracture
Uneven, Brittle, Metallic   
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle   

Cleavage
Perfect on [001] imperfect on [100]   
[001] Perfect   

Mohs Hardness
3   
8   

Chemical Composition
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)   
Al2SiO4(F,OH)2   

Optical Properties >>
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Astrophyllite and Topaz Chemical Formula

While comparing Astrophyllite and Topaz 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 Topaz chemical formula.

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Astrophyllite and Topaz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.

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