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


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

Rhomboid Split Jeff Graham Facet Design

Rhomboid Split Jeff Graham Facet Design

Rhomboid Split (SUN28.JRG)
By Jeff R. Graham
Copyright 2006
90.6% Light Return
Angles for R.I. = 1.54
13 facets + 4 facets on girdle = 17
2-fold symmetry
96 index
L/W = 3.000 T/W = 0.917 T/L = 0.306 P/W = 0.450
C/W = 0.175 H/W = (P+C)/W+0.02 = 0.645 P/H = 0.698 C/H = 0.271 Vol./W^3 = 1.046

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for long skinny-colored material and will work in gold as well. This is basically a reflector and easy to cut. The L/W is not critical.

Rhomboid Split Jeff Graham Facet Design

Detailed faceting instructions by Jeff Graham available at The Rock Peddler