1 Physical Properties
1.2 Tenacity
Not Available
Not Available
1.4 Solubility
Not Available
Not Available
1.6 Durability
Not Available
Not Available
1.7 Specific Gravity
2.97-3.142.54-2.61
1
7.18
1.8 Fracture
Uneven, Conchoidal, Brittle
Gems, Uneven
1.9 Cleavage
{1011} Indistinct
Has perfect cleavage on {001} and good cleavage on {010}. Cleavages intersect at 90°.
1.10 Mohs Hardness
1.13 Chemical Composition
Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
KAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references