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Andalusite
Andalusite

Sylvite
Sylvite



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Andalusite
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Andalusite and Sylvite Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Brittle
1.2 Solubility
Not Available
Soluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.05-3.21
1.993
1.5 Fracture
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
Uneven, Brittle
1.6 Cleavage
Good on {110}, poor on {100}
Perfect on [100], [010], [001]
1.7 Mohs Hardness
7.5
2.5
1.8 Chemical Composition
Al 2SiO 5Michael O’Donoghue , Gems, Sixth edition (2006) More from other references
Not Available

Andalusite and Sylvite Chemical Formula

While comparing Andalusite and Sylvite 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 Andalusite and Sylvite chemical formula.

  • Chemical formula of Andalusite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth edition (2006) More from other references
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Andalusite and Sylvite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Sylvite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Sylvite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 1.993 whereas that of Sylvite is 1.993.

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