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

Rattle (DOME30.JRG)
By Jeff R. Graham
Copyright 2007
87.8% Light Return
Angles for R.I. = 1.62
145 facets + 12 facets on girdle = 157
12-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.266 T/L = 0.266 P/W = 0.405 C/W = 0.336
H/W = (P+C)/W+0.02 = 0.761 P/H = 0.532 C/H = 0.442
Vol./W^3 = 0.270

Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is designed for pale to lightly saturated material and is ideal for nodules.

 

 

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