Orthoclase Facet / Faceting Information
Color: Colorless, champagne to yellow
Moh’s Hardness: 6-6.5
Refractive Index: 1.52-1.568
Critical Angle: 41.14°
Specific Gravity: 2.56-2.62
Cleavage: Perfect in 3 directions, can be a problem when cutting
Fracture: Uneven, somewhat brittle
Heat Sensitivity: Moderate in my experience
Birefringence (double refraction): Weak to medium (.005-.01)
Crystal Structure: Monoclinic
Treatments: Generally none
What I prefer to polishing with: Cerium oxide with a Spectra Ultralap.
Jeff’s Comments: Cuts and polishes easily, use a medium fine lap like a 600 grit for roughing in because a coarse lap can sometimes aggravate cleavage. Cleavage can be a problem, sharp corners have a tendency to chip out sometimes during cutting.
Design Notes: About any Quartz design will work well… I prefer a deeper design and often cut Barions…
Design Links: Tzar – High dome will help improve color and sparkle