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

Ephemeral (SUN11.JRG)
By Jeff R. Graham
Copyright 2006
94.2% Light Return
Angles for R.I. = 1.54
33 facets + 8 facets on girdle = 41
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.193 T/L = 0.193 P/W = 0.466
C/W = 0.158 H/W = (P+C)/W+0.02 = 0.645 P/H = 0.723 C/H = 0.246 Vol./W^3 = 0.218

Addition # 11 - Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for thin good-colored rough and/or shiller. This is very bright and, if cutting in heavy shiller, be sure the flash is 90 degrees to crown. This is also excellent in saturated Garnets.

 

 

 

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