Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Pogo (DOME5.JRG)
By Jeff R. Graham Copyright 2007
81.6% Light Return
Angles for R.I. = 1.62
97 facets + 16 facets on girdle = 113
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.314 T/L = 0.314 P/W = 0.405
C/W = 0.313 H/W = (P+C)/W+0.02 = 0.738 P/H = 0.549 C/H = 0.424 Vol./W^3 = 0.250
PAVILION
CROWN
Addition # 13 – This is ideal for lightly saturated materials and is designed to be cut in a large size, say 10mm and up. Cut in refractive indexes 1.62 to 2.14 with no changes. This is fairly easy to cut.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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