Sunstone (Feldspar, Bytonite, Laboradorite, Spectrolite, Orthoclase)

Merger (SUN12.JRG)
By Jeff R. Graham
Copyright 2006
93.5% Light Return
Angles for R.I. = 1.54
33 facets + 4 facets on girdle = 37
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.519 T/L = 0.519 P/W = 0.466
C/W = 0.162 H/W = (P+C)/W+0.02 = 0.649 P/H = 0.719 C/H = 0.250 Vol./W^3 = 0.293

Addition # 11 - Cut in refractive indexes 1.54 to 2.14 with no changes. This is not hard to cut and finishes a very bright stone. The Crown step can be adjusted to fit your rough, deeper is better. This works well in Garnets too.

 

 

 

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