By Bob Rush
Spencer opal is found in eastern Idaho. It formed in a rhyolite-obsidian flow with incompletely filled gas cavities. It usually presents as...
By Antoinette Rahn and Erin Dana Balzrette
'"Works of art are made of concept, material... and feeling."
~ Kenneth Martin
It's been said, ad nauseam according to some,...
We're counting down the Top 10 photos published in Rock & Gem magazine over the last year.
#4
Precious Black Opal in Petrified Wood
The dark gray to...