Moonstone and Sillimanite Physical Properties

Moonstone

Sillimanite

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Physical Properties

Tenacity

Tough

Solubility

Durability

Specific Gravity

2.56-2.603.20-3.26

1 7.18

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Fracture

Uneven, ConchoidalWalter Schumann

Splintery

Cleavage

2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal

{010} perfect

Mohs Hardness

6-6.56-7.5

2 10

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Chemical Composition

Plagioclase Feldspar s: (Na,Ca)Al_1-2Si_3-2O₈ Orthoclase Feldspar : KAlSi₃O₈

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Moonstone and Sillimanite Chemical Formula

While comparing Moonstone and Sillimanite 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 Moonstone and Sillimanite chemical formula.

Chemical formula of Moonstone- Plagioclase Feldspar s: (Na,Ca)Al_1-2Si_3-2O₈ Orthoclase Feldspar : KAlSi₃O₈
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Semi Precious Gemstones

Moonstone Vs Rubellite

Moonstone Vs Schorlomite

Moonstone Vs Simpsonite

Moonstone and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Moonstone and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Moonstone and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Moonstone is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.