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Diameter, mm (1mm - 0,039inch)

Wholesale "Opal"

Opal is a mineraloid, an amorphous variety of silica. Does not have a crystal lattice. Contains water, when it is lost it becomes cloudy. May have high decorative properties. Opals are characterized by both a variety of colors and complete transparency. In its best examples, it refers to precious stones.

You can see an opal stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Opal

Category Mineraloid
(repeating unit)

Hydrated silica 


IMA symbol Opl
Crystal system Amorphous

Colorless, white, yellow, red, orange,

green, brown, black, blue, pink

Crystal habit Irregular veins, in masses, in nodules
Cleavage None
Fracture Conchoidal to uneven
Mohs scale hardness 5.5–6
Luster Subvitreous to waxy
Streak White
Diaphaneity opaque, translucent, transparent
Specific gravity 2.15+0.08
Density 2.09 g/cm3
Polish luster Vitreous to resinous
Optical properties Single refractive, often anomalous double refractive due to strain
Refractive index 1.450+0.020

Mexican opal may read as low as 1.37, but typically reads 1.42–1.43
Birefringence none
Pleochroism None



black or white body color: inert to white to moderate light blue, green, or yellow in long and short wave, may also phosphoresce, common opal: inert to strong green or yellowish green in long and short wave, may phosphoresce; fire opal: inert to moderate greenish brown in long and short wave, may phosphoresce

Absorption spectra green stones: 660 nm, 470 nm cutoff
Diagnostic features darkening upon heating
Solubility hot salt water, bases, methanol, humic acid, hydrofluoric acid

Code: eee3
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
Min 42*27*16mm/ Max 56*53*24mm

0.00 $ $72.00

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