1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.3 Solubility
Not Available
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1.6 Durability
Not Available
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1.7 Specific Gravity
3.4 Fracture
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Not Available
3.5 Cleavage
{111} Imperfect
Not Available
3.6 Mohs Hardness
3.12 Chemical Composition
Na 4AlBeSi 4O 12ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe)Al 2O 4Gemdat.org , Management Team (2012)