Faceting Design Diagram: Torque – Feldspar – Bytonite, Labradorite, Spectrolite, Orthoclase


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

Torque Jeff Graham Facet Design

Torque Jeff Graham Facet Design

Torque (SUN30.JRG)
By Jeff R. Graham
Copyright 2006
81.5% Light Return
Angles for R.I. = 1.54
17 facets + 6 facets on girdle = 23
2-fold symmetry
96 index
L/W = 2.000 T/W = 1.846 T/L = 0.923 P/W = 0.401
C/W = 0.191 H/W = (P+C)/W+0.02 = 0.611 P/H = 0.655 C/H = 0.312 Vol./W^3 = 0.530

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is harder to cut then it looks, the breaks can be tweaked for the table meets. This is for light shiller and colored rough. The L/W is not critical. Note: The pavilion facets are exact opposites and equal.

Torque Jeff Graham Facet Design

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

About the author
Jeff R. Graham
The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as Gram Faceting Designs.
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