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

Port of Call (MC57.JRG)
By Jeff R. Graham
Copyright 2002
82.5% Light Return
Angles for R.I. = 1.62
73 facets + 18 facets on girdle = 91
3-fold, mirror-image symmetry
96 index
L/W = 1.048 T/W = 0.488 T/L = 0.465
P/W = 0.493 C/W = 0.211
H/W = (P+C)/W+0.02 = 0.725
P/H = 0.681 C/H = 0.292
Vol./W^3 = 0.246

Addition # 7 - This design is made to be deep for lighter colored materials and has great dispersion. Cut it refractive indexes 1.62 to 1.93 with no changes. I like this in white Zircon...

 

 

 

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