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

Spokes (MC46.JRG)
By Jeff R. Graham
Copyright 2000
93.2% Light Return
Angles for R.I. = 1.62
49 facets + 12 facets on girdle = 61
6-fold, mirror-image symmetry
96 index
L/W = 1.059 T/W = 0.327 T/L = 0.308
P/W = 0.447 C/W = 0.179
H/W = (P+C)/W+0.02 = 0.646
P/H = 0.692 C/H = 0.277
Vol./W^3 = 0.220

Addition # 7 - I designed this for medium saturated material and use it for earrings. The spokes show up on the crown nicely. This works well in Garnet and Sapphire with no changes.

 

 

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