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

Boxed Glitter (MC93.JRG)
By Jeff R. Graham
Copyright 2006
83.4% Light Return
Angles for R.I. = 1.62
153 facets + 20 facets on girdle = 173
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.527 T/L = 0.527 P/W = 0.544
C/W = 0.187 H/W = (P+C)/W+0.02 = 0.751 P/H = 0.724 C/H = 0.249
Vol./W^3 = 0.342

Addition # 12 - This is great for lightly saturated materials. Cut in refractive indexes 1.62 to 2.14 (87.9%) with no changes.

 

 

 

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