Faceting Design Diagram: Tejas – Tourmaline, Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Tejas Jeff Graham Facet Design 1 Tejas Jeff Graham Facet Design 2

Tejas (DOME42.JRG)
By Jeff R. Graham
Copyright 2007
92% Light Return
Angles for R.I. = 1.62
51 facets + 10 facets on girdle = 61
5-fold, mirror-image symmetry
80 index
L/W = 1.000 T/W = 0.200 T/L = 0.200 P/W = 0.384 C/W = 0.257
H/W = (P+C)/W+0.02 = 0.661 P/H = 0.581 C/H = 0.389
Vol./W^3 = 0.198

Addition # 13 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is very bright and works best in medium saturated material. This is not hard to cut and the shallow dome makes an interesting effect.

Tejas Jeff Graham Facet Design 3

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.