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

Battle Mountain (SUN39.JRG)
By Jeff R. Graham
Copyright 2006
80.6% Light Return
Angles for R.I. = 1.54
29 facets + 8 facets on girdle = 37
2-fold, mirror-image symmetry
96 index
L/W = 3.000 T/W = 1.216 T/L = 0.405 P/W = 0.450
C/W = 0.244 H/W = (P+C)/W+0.02 = 0.714 P/H = 0.630 C/H = 0.342 Vol./W^3 = 1.026

Addition # 11 - Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for long sliver shaped rough and is good for light to medium color. It will work on light shiller.

 

 

 

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