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


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

Tilt Jeff Graham Facet Design

Tilt Jeff Graham Facet Design

Tilt (SUN16.JRG)
By Jeff R. Graham
Copyright 2006 84.7%
Light Return Angles for R.I. = 1.54
25 facets + 4 facets on girdle = 29
2-fold, mirror-image symmetry
96 index
L/W = 2.014 T/W = 0.368 T/L = 0.183 P/W = 0.467
C/W = 0.190 H/W = (P+C)/W+0.02 = 0.677 P/H = 0.690 C/H = 0.280 Vol./W^3 = 0.779

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is for those long layers of Sunstone that are dichroiac, different colors on different axis’s. I made this design so the color could be split down the keel length-wise and as the stone rocks the colors will change. The L/W on this design is not critical, 2.0 to 3.0 works well. This also works for single color material.

Tilt 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.