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Phenakite
Phenakite

Sylvite
Sylvite



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Phenakite
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Sylvite

Phenakite and Sylvite Physical Properties

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Physical Properties

Tenacity

Brittle
Brittle

Solubility

-
Soluble

Durability

-
-

Specific Gravity

2.90-2.981.993
1 7.18
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Fracture

Conchoidal, ConchoidalWalter Schumann
Uneven

Cleavage

Distinct on {11 2 0}, imperfect on {10 1 1}
Perfect on [100], [010], [001]

Mohs Hardness

7.5-82.5
2 10
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Chemical Composition

Be 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
KCl

Phenakite and Sylvite Chemical Formula

While comparing Phenakite 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 Phenakite and Sylvite chemical formula.

  • Chemical formula of Phenakite- Be 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
  • Chemical formula of Sylvite- KCl

Phenakite and Sylvite Specific Gravity

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