Water Opal (Jelly Opal)

Big Photo

Mexico
13.45 carats
© Mineral Classics

Bluish-gray Precious Opal with little play-of-colour and gelatinous appearance. Water opals are best known from Mexico.

Water Opal Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 

Water Opal Gemstones by Size

This table shows distribution of Water 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:3.36 cts
Heaviest:13.45 cts
Average:8.40 cts
Total photos:2
Do you have a larger Water Opal? Why not upload a photo?
3.36ct to 4.37ct4.37ct to 5.38ct5.38ct to 6.39ct6.39ct to 7.40ct7.40ct to 8.41ct8.41ct to 9.41ct9.41ct to 10.42ct10.42ct to 11.43ct11.43ct to 12.44ct12.44ct to 13.45ct
General Information
A variety or type of:Precious Opal, which is a variety of Opal
Other Names/Trade Names:
Chemical Formula
SiO
 
2
· nH
 
2
O
Walter Schumann, Gemstones of the world (2001)
Physical Properties of Water Opal
Mohs Hardness5.5 to 6.5
Walter Schumann, Gemstones of the world (2001)
Specific Gravity1.98 to 2.50
Walter Schumann, Gemstones of the world (2001)
TenacityBrittle
Walter Schumann, Gemstones of the world (2001)
Cleavage QualityNone
Walter Schumann, Gemstones of the world (2001)
FractureConchoidal,Splintery
Walter Schumann, Gemstones of the world (2001)
Optical Properties of Water Opal
Refractive Index1.37 to 1.52
Walter Schumann, Gemstones of the world (2001)
BirefringenceNone
Walter Schumann, Gemstones of the world (2001)
PleochroismAbsent
Walter Schumann, Gemstones of the world (2001)
DispersionNone
Walter Schumann, Gemstones of the world (2001)
Colour
Colour (General)Bluish-gray with little play-of-colour
Walter Schumann, Gemstones of the world (2001)
TransparencyTranslucent
Walter Schumann, Gemstones of the world (2001)
Crystallography of Water Opal
Crystal SystemAmorphous
Walter Schumann, Gemstones of the world (2001)
Further Information
Mineral information:Water Opal information at mindat.org
Significant Gem Localities
Australia
 
  • New South Wales
    • Finch Co.
    • Yungnulgra Co.
  • South Australia
    • Central North
USA
 
  • Nevada
    • Humboldt Co.
      • Virgin Valley
  • Oregon
    • Morrow Co.
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