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

Deva (SUN21.JRG)
By Jeff R. Graham
Copyright 2006
77.3% Light Return
Angles for R.I. = 1.54
46 facets + 5 facets on girdle = 51
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.375 T/L = 0.356 P/W = 0.501
C/W = 0.225 H/W = (P+C)/W+0.02 = 0.746 P/H = 0.672 C/H = 0.301 Vol./W^3 = 0.278

Addition # 11 - Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for clear or pale colors. It works well in about any lightly saturated material. I like it in Aquamarine. Note: The girdle can be cut in first and the P1 cut to meet so that center point is not needed and it saves rough.

 

 

 

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