Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Crystal Tourmaline (TLINE8.JRG)
By Jeff R. Graham
Copyright 1994
81.0% Light Return
Angles for R.I. = 1.62
43 facets + 9 facets on girdle = 52
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.467 T/L = 0.435
P/W = 0.441 C/W = 0.177
H/W = (P+C)/W+0.02 = 0.638
P/H = 0.692 C/H = 0.277
Vol./W^3 = 0.241

Gram Book 1 - This design is a nice one. It works great for material that has this shape on the "C" axis. It should be cut in a little larger size, and any color that has good light through the "C", 1-6cts. This works very well cut in the Nigerian pink Tourmaline. Cut in refractive index 1.62 to 1.93 (83.6%) with no changes.

 

 

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