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

Glitter Squared #2 (MC106.JRG)
By Jeff R. Graham
Copyright 2006
90% Light Return
Angles for R.I. = 1.62
121 facets + 4 facets on girdle = 125
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.418 T/L = 0.418 P/W = 0.620
C/W = 0.231 H/W = (P+C)/W+0.02 = 0.871 P/H = 0.712 C/H = 0.265 Vol./W^3 = 0.443

Addition # 12 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is designed to be a large stone and it works well in light to medium saturations. This is not hard to cut, but does takes some experience.

 

 

 

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