Scapolite Faceting Information


Scapolite Facet / Faceting Information

Yellow Scapolite Prince

Color: Yellow, purple, pink, colorless, greenish
Moh’s Hardness: 5-6
Refractive Index: 1.54-1.56
Critical Angle: 40.49°
Specific Gravity: 2.57-2.74
Cleavage: Perfect in 2 directions
Fracture: Conchoidal, brittle
Dispersion: .017
Heat Sensitivity: Moderate
Dichroic: Moderate
Birefringence (double refraction): Weak to medium (.009-.020)
Crystal Structure: Tetragonal

Treatments: Generally none, but Purple may be irradiated and/or heat treated

What I prefer to polishing with: Alumina oxide on a Tin lap, Spectra Ultralap

Jeff’s Comments: Heat during dopping can cause problems. Orientate for best color which is often the “c” axis. Use a medium fine lap for roughing in.

Design Notes: About any Quartz design will work well.

Design Links: Prince -This will work nicely

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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