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

Sholtz’s Strudel (MIR6.JRG)
By Jeff R. Graham
Copyright 2004
91.8% Light Return
Angles for R.I. = 1.62
33 facets + 8 facets on girdle = 41
4-fold symmetry
96 index
L/W = 1.000 T/W = 0.204 T/L = 0.204
P/W = 0.422 C/W = 0.196
H/W = (P+C)/W+0.02 = 0.639
P/H = 0.661 C/H = 0.307
Vol./W^3 = 0.259

Addition # 9 – Note: The corners on this can be varied, in general, cut the corners as close to the diagram as you can. This cuts very fast and is nice in about any material. Cut in refractive indexes 1.62 to 1.93 with no changes.

 


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler