Goshenite Facet / Faceting Information


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Goshenite Facet / Faceting Information

Goshenite (Beryl)

goshenite

Color: Colorless
Moh's Hardness: 7.5-8
Refractive Index: 1.57-1.60
Critical Angle: 39.87°
Specific Gravity: 2.65-2.75
Cleavage: None
Fracture: Conchoidal, tough
Dispersion: .014
Heat Sensitivity: Slightly
Dichroism: None
Birefringence (double refraction): Weak (.006-.009)
Crystal Structure: Hexagonal

Treatments: None usually.

What I prefer to polishing with: Cerium oxide with a Spectra Ultralap.

Jeff's Comments: Cuts and polishes like any other Beryl, usually no problems... I like to use a 1200 Nu Bond lap for pre-polish, it makes the polishing stage faster and easier. Orientating on the "c" is slightly better. Watch for silk and lilly pad type of inclusions perpendicular to the "c" axis.

Design Notes: About any design will work well... I prefer a deeper design and often cut Barions.

Design Links: Signature #4 - This is one of my favorite cuts in Beryl
Blue Ice - Designed for very long crystals


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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