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

Glitter (MC85.JRG)
By Jeff R. Graham
Copyright 2003
80.7% Light Return
Angles for R.I. = 1.62
145 facets + 16 facets on girdle = 161
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.443 T/L = 0.443 P/W = 0.462
C/W = 0.230 H/W = (P+C)/W+0.02 = 0.712 P/H = 0.648 C/H = 0.324 Vol./W^3 = 0.264

Addition # 12 - It helps to cut the table in before cutting C7. This is not hard to cut, just a lot of work. Cut this in refractive indexes 1.62 to 2.14 (89.2%) with no changes.

 

 

 

 

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