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

Viking’s Luck (CHECK71.JRG)
By Jeff R. Graham
Copyright 2003
82.7% Light Return
Angles for R.I. = 1.62
47 facets + 8 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.602 T/W = 0.515 T/L = 0.322
P/W = 0.436 C/W = 0.262
H/W = (P+C)/W+0.02 = 0.717
P/H = 0.607 C/H = 0.365
Vol./W^3 = 0.516

Addition # 8 – This is not very easy to cut, but after you have done it once, it’s not hard the next time. The L/W is not critical but should be close. Cut In refractive indexes 1.62 tp 2.14 with no changes.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler