Apophyllite KF and Sillimanite Physical Properties

Apophyllite KF

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.33-2.373.20-3.26

1 7.18

1.5 Fracture

Uneven, Brittle, Uneven, Brittle, Uneven

Splintery

1.6 Cleavage

Perfect on {001}, imperfect on {110}

{010} perfect

1.7 Mohs Hardness

4.5-56-7.5

2 10

1.8 Chemical Composition

(K,Na)Ca4Si8O20(F,OH)•8(H2O)

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

Apophyllite KF and Sillimanite Chemical Formula

While comparing Apophyllite KF 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 Apophyllite KF and Sillimanite chemical formula.

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

Compare Green Gemstones

Apophyllite KF Vs Nepouite

Apophyllite KF Vs Langbeinite

Apophyllite KF Vs Hauyne

Apophyllite KF and Sillimanite Specific Gravity

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