Periclase Value, Price, and Jewelry Information


Periclase - synthetic
“Magnesium Oxide (Periclase),” synthetic, doped with nickel, ~ 5 carats. Photo © Joel E. Arem, PhD, FGA. Used with permission.

Periclase has been synthesized in large masses in the laboratory, but these have no market significance. A faceted natural periclase would be a great rarity due to the extreme scarcity of suitable faceting rough. The expected size would be less than 1 carat.

Periclase Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Periclase Information

DataValue
NamePericlase
Crystallography Isometric. Crystals octahedral, cubic; commonly as rounded grains.
Refractive Index 1.736
Colors Colorless, white, gray, yellow, brownish yellow, green, black.
Luster Vitreous.
Fracture Uneven
Hardness 5.5
Specific Gravity 3.56.
Birefringence None.
Cleavage Perfect 1 direction
Stone SizesI have not seen any faceted gems, but if such gems existed, they would be very small. Transparent grains from Vesuvius might be cuttable, but in general periclase is not known in transparent. large crystals.
Luminescence Pale yellow in LW (Terlingua, Texas).
Transparency Transparent.
FormulaMgO
Pleochroism None.
Optics Isotropic; = 1.736.

Optics: Isotropic; N: 1.736.

Occurrence: Occurs in marbles, due to high-temperature contact metamorphism.

Texas; New Mexico.

Spain; Sardinia; Czech Republic; Slovakia.

Crestmore, Riverside County, California: embedded grains.

Vesuvius, Italy: as glassy grains in the lava rocks.

Nordmark, Sweden: in the Mn mines.

Comments: Periclase has been synthesized in large masses in the laboratory, but these have no market significance. A faceted natural periclase would be a great rarity due to the extreme scarcity of suitable faceting rough. The expected size would be less than 1 carat.

Name: From the Greek peri plus klastos, to break around, in allusion to the cleavage.