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

Snowflake (TLINE13.JRG)
By Jeff R. Graham
Copyright 1993
75.9% Light Return
Angles for R.I. = 1.62
169 facets + 16 facets on girdle = 185
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.440 T/L = 0.440
P/W = 0.441 C/W = 0.172
H/W = (P+C)/W+0.02 = 0.633
P/H = 0.697 C/H = 0.272
Vol./W^3 = 0.218

Addition # 1 - This design makes a nice stone in light material and because of the number of facets I cut it in a large size. It's reflection is higher than it ray traces and takes some work to cut. Cut in refractive indexes 1.62 to 1.93 (89.1%) with no changes.

 

 

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