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

Rapids (DOME40.JRG)
By Jeff R. Graham
Copyright 2007
83.1% Light Return
Angles for R.I. = 1.62
97 facets + 12 facets on girdle = 109
12-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.349 T/L = 0.349 P/W = 0.419 C/W = 0.315
H/W = (P+C)/W+0.02 = 0.754 P/H = 0.556 C/H = 0.418
Vol./W^3 = 0.267

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. It is not hard to cut, but there are quite a few facets so it will take some time.

 

 

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