Orbicular Jasper

Big Photo

USA
33.79 carats
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Orbicular jasper is a variety of Jasper which contains orbs or spherical inclusions of different colours. In highly silicified rhyolite or tuff, quartz and feldspar crystallize in radial aggregates of needle-like crystals which provide the basis or seed for the orbicular structure seen in this kind of jasper.

The material is very attractive when polished and is used as a gemstone and ornamental stone.
15 photos

Orbicular Jasper Gemstones by Colour

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

Orbicular Jasper Gemstones by Size

This table shows distribution of Orbicular Jasper 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:4.48 cts
Heaviest:66.36 cts
Average:36.98 cts
Total photos:15
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4.48ct to 10.67ct10.67ct to 16.86ct16.86ct to 23.04ct23.04ct to 29.23ct29.23ct to 35.42ct35.42ct to 41.61ct41.61ct to 47.80ct47.80ct to 53.98ct53.98ct to 60.17ct60.17ct to 66.36ct
General Information
A variety or type of:Jasper, which is a variety of Chalcedony, which is a variety of Quartz
Further Information
Mineral information:Orbicular Jasper information at mindat.org
Significant Gem Localities
Madagascar
 
  • Sofia
    • Analalava District
      • Ambolobozo
mindat.org
USA
 
  • California
    • Santa Clara County
      • bounded by the Santa Cruz Mountains to the west and the Diablo Range to the east
        • Paradise Valley
Melhase, John (1934), A diversity of many fine minerals available in California for collectors: Oregon Mineralogist: 2(7): 7; Mineralogist, The (1935): 3(3): 34; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 318; www.cst.cmich.edu/users/dietr1rv/jasper.htm
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