Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Pure (DOME1.JRG)
By Jeff R. Graham
Copyright 1999
79.6% Light Return
Angles for R.I. = 1.62
49 facets + 6 facets on girdle = 55
6-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.409 T/L = 0.354 P/W = 0.435
C/W = 0.392 H/W = (P+C)/W+0.02 = 0.847 P/H = 0.513 C/H = 0.463 Vol./W^3 = 0.362
PAVILION
CROWN
Addition # 13 – This is designed for light colored material, pale pink is nice. It is easy to cut and has a nice flash pattern. Cut in refractive indexes 1.62 to 2.14 with no changes. This is quick to cut and is ideal for Tourmaline nodules.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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