Brookite and Apophyllite KF Physical Properties

Brookite

Apophyllite KF

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.87-4.142.33-2.37

1 7.18

1.5 Fracture

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

Uneven, Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

Poor on {120}, in traces on {001}

Perfect on {001}, imperfect on {110}

1.7 Mohs Hardness

5.5-64.5-5

2 10

1.8 Chemical Composition

TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

(K,Na)Ca4Si8O20(F,OH)•8(H2O)

Brookite and Apophyllite KF Chemical Formula

While comparing Brookite 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 Brookite and Apophyllite KF chemical formula.

Chemical formula of Brookite- TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Apophyllite KF- (K,Na)Ca4Si8O20(F,OH)•8(H2O)

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Brookite and Apophyllite KF Specific Gravity

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