Blue John and Legrandite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.00-3.25
3.98-4.04
Fracture
Not Available
Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle
Cleavage
Not Available
Imperfect, poor one {100}
Mohs Hardness
Not Available
4.5-5
Chemical Composition
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Blue John and Legrandite Chemical Formula
While comparing Blue John and Legrandite 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 Legrandite chemical formula.
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Legrandite- Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Blue John and Legrandite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Blue John and Legrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Blue John and Legrandite Optical Properties during the identification of gemstone. Specific gravity of Blue John is 3.98-4.04 whereas that of Legrandite is 3.98-4.04.