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

Fluorescent Minerals (UV) "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: 3048
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
47*35*18mm

0.00 $ $36.36

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

0.00 $ $72.00

Code: 2258
Pegmatite No. 60, Flora site, Salsurt, Lovozersky massif, Kola Peninsula, RF
58*50*45mm

0.00 $ $70.91

Code: 1981
Golutvin, Moscow region, RF
77*47*53mm

0.00 $ $12.73

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

Code: 2859
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
64*47*35mm

0.00 $ $90.91

Code: 2860
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
29*14*14mm

0.00 $ $14.18

Code: 2627
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
70*50*50mm

0.00 $ $107.27

Code: 2628
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
48*35*17mm

0.00 $ $48.00

Code: 2629
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
33*16*15mm

0.00 $ $16.36

Code: 2630
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
76*58*46mm

0.00 $ $76.36

Code: 590
Saratov region, RF
186*150*66mm

0.00 $ $287.27

Code: 1723
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
84*36*43mm

0.00 $ $53.45

Code: 1722
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
58*40*26mm

0.00 $ $53.45

Code: 1692
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
51*42*22mm

0.00 $ $40.36

Code: 1721
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
52*50*32mm

0.00 $ $25.45

Code: 962
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
35*31*22mm

0.00 $ $16.36

Code: 819
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
36*33*26mm

0.00 $ $18.18

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