Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Rattle (DOME30.JRG)
By Jeff R. Graham
Copyright 2007
87.8% Light Return
Angles for R.I. = 1.62
145 facets + 12 facets on girdle = 157
12-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.266 T/L = 0.266 P/W = 0.405 C/W = 0.336
H/W = (P+C)/W+0.02 = 0.761 P/H = 0.532 C/H = 0.442
Vol./W^3 = 0.270
PAVILION
CROWN
Addition # 13 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is designed for pale to lightly saturated material and is ideal for nodules.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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