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Precious Opal and Phenakite Physical Properties


Physical Properties

Tenacity
Brittle   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.90-2.98   
1.98-2.25   

Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle   
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references   

Cleavage
Distinct on {11 2 0}, imperfect on {10 1 1}   
Not Available   

Mohs Hardness
7.5-8   
5-6.5   

Chemical Composition
Be 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references   
SiO 2 · nH 2OGemdat.org , Management Team (2012)   

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