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Blue John
Blue John

Apophyllite KF
Apophyllite KF



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Blue John
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Apophyllite KF

Blue John and Apophyllite KF Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Brittle
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.00-3.25
2.33-2.37
1.5 Fracture
Not Available
Uneven, Brittle, Uneven, Brittle, Uneven
1.6 Cleavage
Not Available
Perfect on {001}, imperfect on {110}
1.7 Mohs Hardness
Not Available
4.5-5
1.8 Chemical Composition
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)
(K,Na)Ca4Si8O20(F,OH)•8(H2O)

Blue John and Apophyllite KF Chemical Formula

While comparing Blue John 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 Blue John and Apophyllite KF chemical formula.

  • Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Apophyllite KF- (K,Na)Ca4Si8O20(F,OH)•8(H2O)

Blue John and Apophyllite KF Specific Gravity

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