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


Organic Gems
Organic Gems are gems formed from or by plants or animals. They might also be fossils.
Soapstone
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Sliding Rocks
Sliding Rocks Mystery: What causes these rocks to slide across a Death Valley playa?
bear attack
Bear Attacks! Knowing how to react to a bear encounter and attack could save your life.
Labradorite
Labradorite: A feldspar that produces bright flashes of iridescent colors.
Ticks
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Solar System Volcanoes
Solar System Volcanoes: Earth is not the only location of volcanic activity.
Ammolite
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.


Boulder Opal



boulder opal
More Gemstones
  Fee Mining
  Extraterrestrial Gems
  Ant Hill Garnets
  Emerald
  Ametrine
  Scapolite
  Tanzanite
  Ammolite

© 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.