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

Foiled (MC79.JRG)
By Jeff R. Graham
Copyright 2002
91.6% Light Return
Angles for R.I. = 1.62
67 facets + 12 facets on girdle = 79
6-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.416 T/L = 0.388
P/W = 0.430 C/W = 0.209
H/W = (P+C)/W+0.02 = 0.658
P/H = 0.653 C/H = 0.317
Vol./W^3 = 0.237

Addition # 7 - This is nice, easy to cut and has a fancy look to it when finished. Cut in refractive indexes 1.62 to 1.93 with no changes. This is very good for light to medium saturated materials.

 

 

 

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