Crystal Opal
Australia
24.92 carats
© irocks.com
Crystal Opal Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Crystal Opal Gemstones by Size
This table shows distribution of Crystal Opal gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:1.14 cts
Heaviest:24.92 cts
Average:8.74 cts
Total photos:7
Do you have a larger Crystal Opal? Why not upload a photo?
| General Information | ||||||||||||||||||
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| A variety or type of: | Precious Opal, which is a variety of Opal | |||||||||||||||||
| Chemical Formula |
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| Physical Properties of Crystal Opal | ||||||||||||||||||
| Mohs Hardness | 5.5 to 6.5, Gemmological Tables (2004) | |||||||||||||||||
| Specific Gravity | 1.97 to 2.22, Gemmological Tables (2004) | |||||||||||||||||
| Tenacity | Brittle, Gemstones of the world (2001) | |||||||||||||||||
| Cleavage Quality | None, Gemstones of the world (2001) | |||||||||||||||||
| Fracture | Conchoidal, Gemstones (2009) | |||||||||||||||||
| Optical Properties of Crystal Opal | ||||||||||||||||||
| Refractive Index | 1.370 to 1..470, Blue Chart Gem Identification (2010) | |||||||||||||||||
| Optical Character | Isotropic, Gemstones (2009) | |||||||||||||||||
| Birefringence | None, Gemstones of the world (2001) | |||||||||||||||||
| Pleochroism | Absent, Gemstones of the world (2001) | |||||||||||||||||
| Dispersion | None, Gemstones of the world (2001) | |||||||||||||||||
| Colour | ||||||||||||||||||
| Colour (General) | Black, white, colourless, yellow, bluish, Management Team (2012) The colour play is visible both on the surface and in the interior | |||||||||||||||||
| Transparency | Transparent,Translucent, Management Team (2012) | |||||||||||||||||
| Lustre | Vitreous, Gemstones (2009) | |||||||||||||||||
| Crystallography of Crystal Opal | ||||||||||||||||||
| Crystal System | Amorphous, Blue Chart Gem Identification (2010) | |||||||||||||||||
| Habit | Massive, Gemstones (2009) | |||||||||||||||||
| Further Information | ||||||||||||||||||
| Mineral information: | Crystal Opal information at mindat.org | |||||||||||||||||
| Significant Gem Localities | ||||||||||||||||||
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