Template:Tourmaline

From The Gemology Project
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Tourmaline
Chemical composition Complex Borosilicate
Crystal system Trigonal
Habit edit me
Cleavage edit me
Fracture edit me
Hardness 7.5
Optic nature edit me
Refraction index 1.62 - 1.64
Birefringence edit me
Dispersion edit me
Specific gravity 3.06
Lustre Vitreous
Pleochroism edit me