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

Styx & Stones (CHECK76.JRG)
By Jeff R. Graham
Copyright 2003
87% Light Return
Angles for R.I. = 1.62
57 facets + 12 facets on girdle = 69
2-fold, mirror-image symmetry
96 index
L/W = 1.500 T/W = 0.485 T/L = 0.323
P/W = 0.608 C/W = 0.273
H/W = (P+C)/W+0.02 = 0.901
P/H = 0.675 C/H = 0.303
Vol./W^3 = 0.448

Addition # 8 - This is ideal for lightly saturated rough and has a little different look. Note: The P5 cuts in to meet P1, P4 and P7(G) is cut to meet. Cut in refractive indexes 1.56 (86.7%) to 1.93 with no changes.

 

 

 

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