Bi-color

From The Gemology Project
Revision as of 01:44, 10 January 2007 by Africanuck (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search
Bi-color Tourmaline
Chemical composition Complex borosilicate
Crystal system Trigonal
Habit Prismatic
Cleavage None
Fracture Conchoidal
Hardness 7- 7.5
Optic nature Uniaxial -
Refractive index 1.62 - 1.64
Birefringence 0.014 - 0.040
Dispersion Low, 0.017
Specific gravity 3.01 - 3.11
Lustre Vitreous
Pleochroism Strong

Properties in table to be verified please!

Bi-color tourmaline
Photo courtesy of Lembeck Gems