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