Origin
Southern and central Africa
-
Color
Red, Blue, Green, Reddish, Brown
Brownish, Black
Specific Gravity
3.79-3.94
3.26
Fracture
Lamellar, Splintery
Uneven
Cleavage
{100} Good, {001} Good, {010} Poor
None
Chemical Composition
FeAs
NaFe3+3Fe3+6(BO 3) 3Si 6O 18(O,OH) 4Anthony et al , Handbook of Mineralogy (2001)
Pleochroism
-
Strong: yellow-brown
Transparency
TranslucentAnthony et al
Translucent
Refractive Index
1.670-1.734
-9999
Birefringence
-9999
-9999
Clarity
TranslucentAnthony et al
Translucent
Qualities Associated
Emotional Healing
Protection