Color
Red, Yellow, Brown, orange, gray, Green
Blue, Green
Specific Gravity
6.50-7.00
3.80-4.15
Fracture
Irregular, Conchoidal
Uneven
Cleavage
On {011}, distinct; on {001}, {013}, indistinct
perfect along [010] and [100]
Chemical Composition
PbMoO 4Walter Schumann , Gemstones of the world (2001)
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Luster
Adamantine, Resinous
Silky
Pleochroism
Weak
X = very pale blue; Y = pale blue; Z = deep blue
Transparency
Transparent
Translucent
Refractive Index
2.280-2.405
1.752-1.815
Crystal System
tetragonal
Orthorhombic
Birefringence
0.122
0.063
Clarity
Transparent
Translucent
Psychology
Confidence
Communication
Healing
Physical healing
Emotional healing
Qualities Associated
Confidence
Communication