joias6.tumblr.com
Gems at the corner
Geyser Opal from Spencer Idaho U.S.A Spenser Opal was deposited in volcanic rocks app 4 million years ago by geysers.The primary formation of the Spencer opal mines is a rhyolite and obsidian flow filled with gas pockets. The secondary deposit is a solution of silica and water, trapped within the rock and released by a series of geysers.
