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

Flash'n Diamonds (CHECK62.JRG)
By Jeff R. Graham
Copyright 2003
80.1% Light Return
Angles for R.I. = 1.62
45 facets + 16 facets on girdle = 61
2-fold, mirror-image symmetry
96 index
L/W = 2.001 T/W = 0.536
T/L = 0.268 P/W = 0.472 C/W = 0.208
H/W = (P+C)/W+0.02 = 0.699
P/H = 0.674 C/H = 0.297
Vol./W^3 = 0.571

Addition # 8 - This is designed for crystal Tourmaline... There is not much that can be done with long crystals besides a rectangle, this is a nice change of pace. This works well in about any color. Cut in refractive indexes 1.62 to 1.93 with no changes.

 

 

 

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