Origin
Southern and central Africa
Southern and central Africa
Color
Colorless, Yellow
Colorless, Greenish, Green, gray, Yellow
Specific Gravity
2.59-2.60
3.21-3.38
Fracture
-
Irregular/uneven, Uneven
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
Perfect on {001}
Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Pleochroism
none.
StrongArthur Thomas
Transparency
TransparentAnthony et al
Transparent
Refractive Index
1.583-1.614
1.670-1.734
Crystal System
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
monoclinic
Birefringence
-9999
0.006-0.011
Clarity
TransparentAnthony et al
Transparent
Cardiovascular
Promotes mental clarity
-
Psychology
Harmony
Empathy
Healing
Emotional healing
Emotional healing
Qualities Associated
Creativity
Empathy