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

Home » Gemstones » Opal » Common Opal

Common Opal or "Potch"

Pictures of beautiful common opals



What is Common Opal?



The definition of "Common opal" is a stone that does not exhibit a "play of color". Although most of these stones are also "common" in appearance and do not attract commercial attention, some of them are beautiful. This material is given the name "common opal" because it is found in many locations throughout the world. Some people in the trade also call common opal by the name "potch".


Beautiful Common Opal



Gemstone hunters seek out specimens of common opal that are attractive, colorful and and accept a lustrous polish. They can be beautiful but simply lack a play of color that would earn them the name "precious". Common opal is frequently cut as a gemstone and can sell for attractive prices.


Examples of Common Opal



Shown at right is a beautiful blue teardrop-shaped stone cut from common opal mined in Peru. It is 13x8 millimeters in size and weighs 2.3 carats. Also at right is a collection of common opal 4 millimeter beads ranging from white to pink to lavendar in color. The material used to produce these beads was also mined in Peru. The third photo at right shows two Morado Opal cabochons. "Morado" is Spanish for "purple" and some stones cut from purple material mined in Mexico are given the trade name "Morado".






Find it on Geology.com




More from Geology.com


Methane Hydrate
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
World Oil Shales
Oil Shales in Australia, Brazil, Canada, China, Israel, Russia, Syria, United States and others.
dowsing
Dowsing is a method used to find underground water that is rejected by most geologists.
shale gas
Shale Gas is natural gas trapped within shale. It is a growing source of US supply.
Crushed Stone
Crushed Stone - About four tons per person is used each year in the United States.
volcanic explosivity index
Volcanic Explosivity: Learn about some of the most explosive volcanic eruptions.
lightning map
Lightning Strikes Map - A NASA map showing the worldwide distribution of lightning activity.
Largest Desert
Largest Desert: The Sahara is huge but two polar deserts are larger.


blue common opal from Peru
A beautiful blue common opal cut into a 13x8 teardrop cabochon from material mined in Peru.




pink common opal from Peru
Attractive 4 millimeter beads cut from common opal mined in Peru.


purple "Morado" opal
Common opal with a purple color mine in some parts of Mexico is sold under the trade name "Morado" opal. It can be cut into beautiful cabochons.


More Gemstones
  100+ Gems
  Pictures of Opal
  Emerald
  United States Gemstones
  Extraterrestrial Gems
  Ruby and Sapphire
  Diamond
  Labradorite

© 2005-2015 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.