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Diameter, mm (1mm - 0,039inch)
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  1. Index
  2. Fluorescent Minerals (UV)
  3. Opal

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

Murmanite, Hackmanite, Ussingite, Opal, Aegirine (UV)
Code: 4857
Murmanite, Hackmanite, Ussingite, Opal, Aegirine (UV)
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
43*39*20mm

0.00 $ $33.33

Serandite, Opal, Hackmanite, Aegirine (UV)
Code: 4507
Serandite, Opal, Hackmanite, Aegirine (UV)
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
44*24*22mm

0.00 $ $33.33

Opal, Hackmanite, Eudialyte, Aegirine
Code: 4508
Opal, Hackmanite, Eudialyte, Aegirine
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
38*21*15mm

0.00 $ $18.33

Opal, Hackmanite, Eudialyte, Aegirine
Code: 4509
Opal, Hackmanite, Eudialyte, Aegirine
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
35*21*16mm

0.00 $ $13.33

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

0.00 $ $33.33

Hackmanite 10ps
Code: eee3
Hackmanite 10ps
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
Min 42*27*16mm/ Max 56*53*24mm

0.00 $ $72.00

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

0.00 $ $65.00

Hackmanite and Eudialyte crystals, Opal, Aegirine (UV) archived
Code: 3047
Hackmanite and Eudialyte crystals, Opal, Aegirine (UV)
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
38*28*18mm

0.00 $ $43.33

Opal, Hackmanite, Murmanite, Aegirine archived
Code: 3049
Opal, Hackmanite, Murmanite, Aegirine
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
36*32*22mm

0.00 $ $33.33

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

0.00 $ $38.33

Opal, Hackmanite, Murmanite, Aegirine archived
Code: 2859
Opal, Hackmanite, Murmanite, Aegirine
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
64*47*35mm

0.00 $ $83.33

Opal, Hackmanite, Murmanite, Aegirine archived
Code: 2860
Opal, Hackmanite, Murmanite, Aegirine
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
29*14*14mm

0.00 $ $13.00

Murmanite, Opal, Hackmanite, Arfvedsonite archived
Code: 2627
Murmanite, Opal, Hackmanite, Arfvedsonite
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
70*50*50mm

0.00 $ $98.33

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

0.00 $ $44.00

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

0.00 $ $15.00

Opal, Hackmanite, Eudialyte, Aegirine archived
Code: 2630
Opal, Hackmanite, Eudialyte, Aegirine
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
76*58*46mm

0.00 $ $70.00

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

0.00 $ $263.33

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

0.00 $ $49.00

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

0.00 $ $49.00

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

0.00 $ $37.00

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