menu

Home » Gemstones » Opal » Boulder Opal

Boulder Opal


Pictures of Boulder Opal


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 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.




boulder opal


More Gemstones
  100+ Gems
  Ruby and Sapphire
  Gifts that Rock!
  Diamond
  Amethyst
  Emerald
  Pictures of Opal
  Geology of Gems

geology store

More From Geology.com:


gem photos
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
rocks
Rock Gallery: Photos of igneous, sedimentary and metamorphic rocks.
tumbled stones
Tumbled Stones are rocks that have been rounded, smoothed and polished in a rock tumbler.
The Largest Tsunami!
The Largest Tsunami! The tsunami with the highest run-up was in Lituya Bay, Alaska.
Rock and Mineral Kits
Rock, Mineral and Fossil Collections: Nice kits for personal or classroom use.
The San Andreas Fault
The San Andreas Fault: A feature that separates the Pacific and North American Plates.
Jade
Jade has been used as a gemstone and a tool-making material for for 1000s of years.
caldera
Calderas are enormous volcanic craters formed by some of Earth\'s largest eruptions.