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

Tejas (DOME42.JRG)
By Jeff R. Graham
Copyright 2007
92% Light Return
Angles for R.I. = 1.62
51 facets + 10 facets on girdle = 61
5-fold, mirror-image symmetry
80 index
L/W = 1.000 T/W = 0.200 T/L = 0.200 P/W = 0.384 C/W = 0.257
H/W = (P+C)/W+0.02 = 0.661 P/H = 0.581 C/H = 0.389
Vol./W^3 = 0.198

Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is very bright and works best in medium saturated material. This is not hard to cut and the shallow dome makes an interesting effect.

 

 

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