Sillimanite and Apophyllite KF Physical Properties

Sillimanite

Apophyllite KF

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.33-2.37

1 7.18

1.5 Fracture

Splintery

Uneven, Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

{010} perfect

Perfect on {001}, imperfect on {110}

1.7 Mohs Hardness

6-7.54.5-5

2 10

1.8 Chemical Composition

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

(K,Na)Ca4Si8O20(F,OH)•8(H2O)

Sillimanite and Apophyllite KF Chemical Formula

While comparing Sillimanite and Apophyllite KF 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 Apophyllite KF chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Apophyllite KF- (K,Na)Ca4Si8O20(F,OH)•8(H2O)

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Sillimanite and Apophyllite KF Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Apophyllite KF Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Apophyllite KF Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.33-2.37 whereas that of Apophyllite KF is 2.33-2.37.