Color: Yellow, purple,
pink, colorless, greenish. Some purple scapolite is irradiated (see
Moh’s hardness: 5-6
Refractive index: 1.54-1.56
Critical angle: 40°
Specific gravity: 2.57-2.74
Cleavage: Perfect in
Dispersion: Medium (.017)
Heat sensitivity: Low,
but heat can cause problems.
– Pink: strong (pink to colorless); Purple: strong (deep purple to light
purple) Yellow: strong (yellow to colorless).
refraction): Weak to medium (.009-.020)
Crystal structure: Tetragonal
Treatments: Purple may
be irradiated and/or heat treated.
Cutting: Cuts easily.
Cleavage is usually not a problem.
Polishing: Cerium oxide
or alumina on most common polishing laps.
Comments: Orient for