In mineralogy, the name olivine is used.

Physical properties:

Chemistry: (Mg, Fe)2SiO4
Hardness: 6½–7
SG: 3.25–3.45
Cleavage: Imperfect, 1 direction
Fracture: Somewhat brittle
Heat sensitivity: Low

Optical properties:

RI: 1.65–1.69
Dispersion: 0.020 (medium)
Double refraction: 0.036 (medium)
Pleochroism: Weak
Critical angle: 37°

Facet angles (pavilion/crown):

Vargas: 42°/41°
Olson: 40°/43°
Soukup: 39°/43°
Roth: 39°/43°
MDR: 39°/43°
Schlagel: 39°/35°
Hashnu: 42°/41°
Sinkankas: 40°/40°
GIA: 40°/42°
Perkins: 39°/43°
Raytech: 40°/39°
Cornwall: 42°/35°
Weikoff: 42°/39°
Carroll: 42.4°/35.3°

Cutting lap:

Medium to fine

Facet polishing:

Vargas: Aluminium oxide on tin/lead, Tin oxide on tin, Cerium oxide on acrylic
Olson: Aluminium oxide or diamond on tin or wood
Soukup: Tin or aluminium oxide on tin or tin/lead
Christiansen: Aluminium oxide on tin/lead or tin, Cerium oxide on acrylic, Diamond on tin or wood
Perkins: Aluminium oxide on BATT or Corian
Raytech: Aluminium oxide on Fast Lap, tin or phenolic

Cabochon polishing:

Christiansen: Aluminium oxide on leather, Diamond on leather or wood, Cerium oxide on felt


According to shape and yield


The only treatment that peridot undergoes is rarely encountered oil or wax impregnation.


It can be difficult to polish. Many add formic or acetic acid to the water during polishing. Diamond on tin is described as a "patent solution" from several sources.

Peridot rough

Peridot on Gemdat

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