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Demantoid and Lazurite Physical Properties


Physical Properties

Tenacity
Brittle   
Not Available   

Solubility
Soluble   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.75   
3.77-3.95   

Fracture
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle   
Not Available   

Cleavage
Imperfect on {110}   
Not Available   

Mohs Hardness
5.5   
6.5   

Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.   
Ca 3Fe 2(SiO 4) 3Ulrich Henn and Claudio C.   

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