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
PAVILION
CROWN
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.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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