McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams

Home » Gemstones » Opal » Boulder Opal

Boulder Opal
Pictures of Boulder Opal


What is Boulder Opal?



"Boulder opal" is a term used for a rough or a cut gemstone that displays opal within its surrounding rock matrix. Opal often forms within voids or fractures in its host rock and specimens of boulder opal reveal this aspect of opal's origin. The contrast of color can be striking when a bright flash of opal is seen within a the surrounding rock material. Many people enjoy the natural appearance of boulder opal and find these gemstones to be beautiful, interesting and educational. The specimens shown here are boulder opal beads cut from Australian boulder opal.



Find it on Geology.com




More from Geology.com


Novarupta
Wrong Volcano! The most powerful eruption of the 20th century was misidentified?
US Diamond Mines
US Diamond Mines: Did you know that diamonds can be found in the United States?
rocks
Rock Gallery: Photos of igneous, sedimentary and metamorphic rocks.
Diamonds
Diamonds: Learn about the properties of diamond, its many uses and diamond discoveries.
uses of gold
The Many Uses of Gold: Unique properties make gold one of the most useful metals.
Gemstones
Gemstones: Fantastic images and articles about colored stones and diamonds.
Labradorite
Labradorite: A feldspar that produces bright flashes of iridescent colors.
oil fields at night
Oil from Space at Night These night views of Earth show oil field illumination and gas flaring.


Boulder Opal



boulder opal
More Gemstones
  Emerald
  Ammolite
  Turquoise
  Pictures of Opal
  Colored Stones
  United States Gemstones
  Ruby & Sapphire
  Peridot

© 2005-2014 Geology.com. All Rights Reserved.
Images, code and content of this website are property of Geology.com. Use without permission is prohibited. Pages on this site are protected by Copyscape.