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

Collectible minerals - full range in stock "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

General
Category Mineraloid
Formula
(repeating unit)

Hydrated silica 

SiO2·nH2O

IMA symbol Opl
Crystal system Amorphous
Identification
Color

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
−0.90
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
−0.080

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

Ultraviolet

fluorescence

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: 4366
Millerovo, Rostov region, RF
69*42*31mm

0.00 $ $21.82

Code: 4367
Millerovo, Rostov region, RF
59*40*9mm

0.00 $ $17.82

Code: 4368
Millerovo, Rostov region, RF
44*40*13mm

0.00 $ $17.82

Code: 3048
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
47*35*18mm

0.00 $ $36.36

Code: 1056
Novotemirsky quarry, Chesmensky district, Chelyabinsk region, RF
24...33mm

0.00 $ $4.36

Code: 1053
Novotemirsky quarry, Chesmensky district, Chelyabinsk region, RF
57*49*32mm

0.00 $ $17.82

Code: 1055
Novotemirsky quarry, Chesmensky district, Chelyabinsk region, RF
28*17*10mm

0.00 $ $6.55

Code: 649
Novo-Cheremshanskoe (Ni) deposit, Verkhneufaleisky district, Chelyabinsk region, South Ural, RF
104*46*39mm

0.00 $ $23.64

Code: 1915
Ermakovskoe deposit, Buryatia, RF
49*36*15mm

0.00 $ $13.09

Code: 1916
Ermakovskoe deposit, Buryatia, RF
49*34*14mm

0.00 $ $13.09

Code: 101
Novotemirsky quarry, Chesmensky district, Chelyabinsk region, South Ural, RF
46*57*28mm

0.00 $ $10.91

Code: 100
Novotemirsky quarry, Chesmensky district, Chelyabinsk region, South Ural, RF
62*60*28mm

0.00 $ $12.73

Code: 99
Novotemirsky quarry, Chesmensky district, Chelyabinsk region, South Ural, RF
78*50*23mm

0.00 $ $12.73

Code: 1660
Novotemirsky quarry, Chesmensky district, Chelyabinsk region, RF
79*59*53mm

0.00 $ $25.09

Code: 1661
Novotemirsky quarry, Chesmensky district, Chelyabinsk region, RF
50*41*16mm

0.00 $ $16.36

Code: 92
Novomoskovsk village, Luhansk region, Ukraine
70*52*20mm

0.00 $ $16.36

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

0.00 $ $72.00

Code: 3047
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
38*28*18mm

0.00 $ $47.27

Code: 3049
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
36*32*22mm

0.00 $ $36.36

Code: 2858
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
38*33*32mm

0.00 $ $41.82

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