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Londonite
Londonite

Topaz
Topaz



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Londonite
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Topaz

Londonite and Topaz Physical Properties

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1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.343.49-3.57
Amber
1 7.18
1.5 Fracture
ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
1.6 Cleavage
None
[001] Perfect
1.7 Mohs Hardness
Not Available8
Amber
2 10
1.8 Chemical Composition
(Cs,K,Rb)Al 4Be 4(B,Be) 12O 28Anthony et al , Handbook of mineralogy (2001)
Al2SiO4(F,OH)2

Londonite and Topaz Chemical Formula

While comparing Londonite and Topaz 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 Londonite and Topaz chemical formula.

  • Chemical formula of Londonite- (Cs,K,Rb)Al 4Be 4(B,Be) 12O 28Anthony et al , Handbook of mineralogy (2001)
  • Chemical formula of Topaz- Al2SiO4(F,OH)2

Londonite and Topaz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Londonite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Londonite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Londonite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.