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

Have One (SUN29.JRG)
By Jeff R. Graham
Copyright 2006
90.1% Light Return
Angles for R.I. = 1.54
15 facets + 6 facets on girdle = 21
2-fold symmetry
96 index
L/W = 3.000 T/W = 2.314 T/L = 0.771 P/W = 0.454
C/W = 0.147 H/W = (P+C)/W+0.02 = 0.621 P/H = 0.732 C/H = 0.236 Vol./W^3 = 0.830

Addition # 11 - Cut in refractive indexes 1.54 to 2.14 with no changes. It seems I always have a piece of rough just about this shape. So here is a design for it. This works well in gold, color, or light shiller.

 

 

 

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