Faceting Design Diagram: Split Flash – Feldspar – Bytonite, Labradorite, Spectrolite, Orthoclase


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

Split Flash Jeff Graham Facet Design

Split Flash Jeff Graham Facet Design

Split Flash (SUN27.JRG)
By Jeff R. Graham
Copyright 2006
90.6% Light Return
Angles for R.I. = 1.54
11 facets + 4 facets on girdle = 15
2-fold symmetry
96 index
L/W = 3.000 T/W = 2.009 T/L = 0.670 P/W = 0.450
C/W = 0.133 H/W = (P+C)/W+0.02 = 0.604 P/H = 0.746 C/H = 0.221 Vol./W^3 = 1.051

Addition # 11 – Cut this in refractive indexes 1.54 to 2.14 with no changes. This is designed for color and light shiller. The pavilion will reflect any color and shiller well. Sunstone seems to occur in long shallow layers and this is for that type of rough. The L/W is not critical.

Split Flash Jeff Graham Facet Design

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Gram Faceting Archive of Information
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.