Home
Gemstones


Sillimanite and Lapis lazuli Physical Properties


Lapis lazuli and Sillimanite Physical Properties


Physical Properties

Tenacity
Tough   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
3.20-3.26   
2.50-3.00   

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

Cleavage
{010} perfect   
3,6   

Mohs Hardness
6-7.5   
5.5   

Chemical Composition
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)   
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4   

Optical Properties >>
<< Astrology

Sillimanite and Lapis lazuli Chemical Formula

While comparing Sillimanite 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 Sillimanite and Lapis lazuli chemical formula.

Compare Blue Gemstones

Sillimanite and Lapis lazuli Specific Gravity

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

Blue Gemstones

Blue Gemstones


Compare Blue Gemstones