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

Glitter Mine (MC86.JRG)
By Jeff R. Graham
Copyright 2003
85.9% Light Return
Angles for R.I. = 1.62
133 facets + 8 facets on girdle = 141
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.452 T/L = 0.452 P/W = 0.437
C/W = 0.185 H/W = (P+C)/W+0.02 = 0.642 P/H = 0.681 C/H = 0.288 Vol./W^3 = 0.205

Addition # 12 - Cut in refractive indexes 1.62 to 2.14 (88.2) with no changes. This is designed for a large stone and works well in light to medium saturated colors. This takes a fair amount of cutting, but is not hard to cut. Rough in the table before cutting the stars, it makes the meets easier.

 

 

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