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Tanzanite
Tanzanite

Herderite
Herderite



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Tanzanite
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Tanzanite and Herderite Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Hard
Not Available
1.4 Specific Gravity
3.35
2.90-3.02
1.5 Fracture
Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
1.6 Cleavage
Perfect {010}, imperfect {100}
Indistinct on {110}
1.7 Mohs Hardness
6.5-7
5-5.5
1.8 Chemical Composition
Ca2Al3(SiO4)3(OH)
CaBePO 4(F,OH)Ulrich Henn and Claudio C.

Tanzanite and Herderite Chemical Formula

While comparing Tanzanite and Herderite 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 Tanzanite and Herderite chemical formula.

  • Chemical formula of Tanzanite- Ca2Al3(SiO4)3(OH)
  • Chemical formula of Herderite- CaBePO 4(F,OH)Ulrich Henn and Claudio C.

Tanzanite and Herderite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Tanzanite and Herderite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Tanzanite and Herderite Optical Properties during the identification of gemstone. Specific gravity of Tanzanite is 2.90-3.02 whereas that of Herderite is 2.90-3.02.