Sunstone (Feldspar, Bytonite, Laboradorite, Spectrolite, Orthoclase)
Button Up (SUN37.JRG)
By Jeff R. Graham
Copyright 2006
88.7% Light Return
Angles for R.I. = 1.54
37 facets + 8 facets on girdle = 45
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.211 T/L = 0.211 P/W = 0.450
C/W = 0.245 H/W = (P+C)/W+0.02 = 0.715 P/H = 0.629 C/H = 0.343 Vol./W^3 = 0.290
Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is fairly easy to cut and designed for light colored rough and watermelons. Be sure and center the color over the point of the pavilion. The color will mix, so check that the colors mix well before cutting.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.
