Sunstone (Feldspar, Bytonite, Labradorite, 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
PAVILION
CROWN
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.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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