1 Physical Properties
1.1 Tenacity
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven, Even, Yellow, White
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
1.6 Cleavage
Perfect on the {001}
Perfect on {110}, poor on {101}, {001} rare
1.7 Mohs Hardness
1.8 Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references