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

Hexed Crystal Glitter (MC121.JRG)
By Jeff R. Graham
Copyright 2006
80.7% Light Return
Angles for R.I. = 1.62
109 facets + 6 facets on girdle = 115
12-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.336 T/L = 0.291 P/W = 0.576
C/W = 0.215 H/W = (P+C)/W+0.02 = 0.811 P/H = 0.710 C/H = 0.265 Vol./W^3 = 0.360

Addition # 12 - Cut in refractive indexes 1.62 to 2,14 with no changes. This works well in light to medium saturated materials. It is very nice in sapphires and Zircons.

 

 

 

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