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

Glitter Squared (MC87.JRG)
By Jeff R. Graham
Copyright 2003
88.9% Light Return
Angles for R.I. = 1.62
129 facets + 8 facets on girdle = 137
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.492 T/L = 0.492 P/W = 0.521
C/W = 0.193 H/W = (P+C)/W+0.02 = 0.734 P/H = 0.710 C/H = 0.263 Vol./W^3 = 0.332

Addition # 12 - The corners of this design float. Cut the P3(G) facet to divide the P1 (81,87 at P5) in equal parts. Cut in refractive indexes 1.62 to 2.14 (89.9%) with no changes.

 

 

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