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

Pentagon (MC80.JRG)
By Jeff R. Graham
Copyright 2002
89.9% Light Return
Angles for R.I. = 1.62
56 facets + 10 facets on girdle = 66
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.439 T/L = 0.418
P/W = 0.433 C/W = 0.179
H/W = (P+C)/W+0.02 = 0.633
P/H = 0.685 C/H = 0.283
Vol./W^3 = 0.220

Addition # 7 - It is fun to cut something different once in a while. This works in about any material. Cut in refractive indexes 1.62 to 2.14 with no changes.

 

 

 

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