1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Decomposed by acids
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Not Available
UnevenWalter Schumann, Gemstones of the world (2001) More from other references, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Uneven
1.6 Cleavage
Perfect on {010}
{110} Perfect, {110} Perfect, {110} Perfect
1.7 Mohs Hardness
1.8 Chemical Composition
(K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references