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

Quell (SUN19.JRG)
By Jeff R. Graham
Copyright 2006
77.4% Light Return
Angles for R.I. = 1.54
73 facets + 16 facets on girdle = 89
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.467 T/L = 0.467 P/W = 0.548
C/W = 0.148 H/W = (P+C)/W+0.02 = 0.716 P/H = 0.765 C/H = 0.207 Vol./W^3 = 0.270

Addition # 11 - Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed to be a deeper RB. It works well in any colored material and is particularly good in Beryl. This is also nice in large yellow Sunstone. 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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