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

Glitter 88 (MC90.JRG)
By Jeff R. Graham
Copyright 2003
81.3% Light Return
Angles for R.I. = 1.62
121 facets + 8 facets on girdle = 129
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.482 T/L = 0.482 P/W = 0.466
C/W = 0.209 H/W = (P+C)/W+0.02 = 0.695 P/H = 0.671 C/H = 0.300 Vol./W^3 = 0.258

Addition # 12 - Cut in refractive indexes 1.62 to 2.14 (90.5%) with no changes. This works well in light to medium saturated materials. Rough in the table and then cut the stars, it make the meets easier.

 

 

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