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

Square Point (TLINE36.JRG)
By Jeff R. Graham
Copyright 1996
75% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.601 T/L = 0.601
P/W = 0.495 C/W = 0.180
H/W = (P+C)/W+0.02 = 0.694
P/H = 0.712 C/H = 0.259
Vol./W^3 = 0.296

Addition # 1 - This cuts easy but the corners are not center point. Watch the meets and make sure that it's square. The P4 are just cut in with no meets (except girdle) and can be varied, 1-12cts. Cut in refractive indexes 1.62 to 1.76 80.95) with no changes.

 

 

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