Boracite and Zinnwaldite Physical Properties
Tenacity
Brittle
  
Elastic
  
Solubility
Soluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.95-2.96
  
2.9-3.1
  
Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
  
Uneven
  
Cleavage
None
  
Perfect basal {001}
  
Mohs Hardness
7-7.5
  
3.5-4.0
  
Chemical Composition
Mg 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
  
Not Available
  
Boracite and Zinnwaldite Chemical Formula
While comparing Boracite and Zinnwaldite 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 Boracite and Zinnwaldite chemical formula.
- Chemical formula of Boracite- Mg 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
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Boracite and Zinnwaldite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Boracite and Zinnwaldite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boracite and Zinnwaldite Optical Properties during the identification of gemstone. Specific gravity of Boracite is 2.9-3.1 whereas that of Zinnwaldite is 2.9-3.1.