Opal

Hardness:
5.5 - 6.5.

Occurrence:
Australia, former Czechoslovakia, U.S., Brazil, Mexico and southern Africa. Opal and tourmaline are the birthstones of the month of October.

Appearance:
Iridescent, and opalescent with a wide range of internal colors.

Something Extra:
Mysterious opals contain the wonders of the skies - sparking rainbows, fireworks, and lightning -
shifting and moving in their depths. Opal has been treasured throughout history around the world.
Archaeologist Louis Leakey found six-thousand year old opal artifacts in a cave in Kenya!

Roman historian Pliny described the beauty of opal as the combination of the beauty of all other
gems: "There is in them a softer fire than the ruby, there is the brilliant purple of the amethyst, and the sea green of the emerald - all shining together in incredible union. Some by their splendor rival the colors of the painters, others the flame of burning sulphur or of fire quickened by oil." Opal was
much loved and valued highly by the Romans, who called it opalus.

The following are different types of Opal:
-    Cat's Eye Opal
-    Mexican Black Opal
-    Mexican Cherry Opal
-    Mexican Fire Opal
-    Mexican Jelly Opal
-    Mexican Matrix Opal
-    Opal Doublet