Origin
Canada, USA, Southern and central Africa
Mexico
Streak
-
Grey, Black, gray
Specific Gravity
3.25-3.50
4.6-4.76
Cleavage
Distinct
Perfect on {0001}
Mohs Hardness
-9999
-9999
Chemical Composition
Ca 10Mg 2Al 4(SiO 4) 5(Si 2O 7) 2(OH) 4Ulrich Henn and Claudio C.
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Transparency
Transparent
OpaqueAnthony et al
Refractive Index
1.700-1.725
1.45-2.62
Optic Character
Uniaxial/-
-
Crystal System
-
Hexagonal
Birefringence
0.002-0.012
-9999
Clarity
Transparent
OpaqueAnthony et al
Neurological
Enhances mental clarity and focus
Enhances mental clarity and focus
Cardiovascular
Supports heart health
Supports heart health
Psychology
Healing
Transformation
Healing
Emotional healing
Emotional healing
Qualities Associated
Healing
Manifestation