Faceting Design Diagram: Hexed Crystal Glitter – Tourmaline, Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Hexed Crystal Glitter Jeff Graham Facet Design Hexed Crystal Glitter Jeff Graham Facet Design

Hexed Crystal Glitter (MC121.JRG)
By Jeff R. Graham
Copyright 2006
80.7% Light Return
Angles for R.I. = 1.62
109 facets + 6 facets on girdle = 115
12-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.336 T/L = 0.291 P/W = 0.576
C/W = 0.215 H/W = (P+C)/W+0.02 = 0.811 P/H = 0.710 C/H = 0.265 Vol./W^3 = 0.360

Addition # 12 – Cut in refractive indexes 1.62 to 2,14 with no changes. This works well in light to medium saturated materials. It is very nice in sapphires and Zircons.

Hexed Crystal Glitter 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.