Gaius Plinius Secundus, a Roman naturalist and natural philosopher, described opal as: there is in them a softer fire than the ruby, there is the brilliant purple of the amethyst, and the sea green of.
Very Fine Mexican Jelly Fire Opal. Most fire opal deposits are in Mexico. They consist of silicon dioxide or silica spheres arranged in an orderly pattern w/iron oxide dispersed throughout giving the fire opal its distinctive brilliant flame-like colors
Opalized snail shell from Coober Pedy, South Australia; one of the leading opal mines in the world. Also, read more on Coober Pedy. One of the hottest places in the world, yet residents live in honeycomb caves that stay nice and cool all day.
The colors are created by microscopic water drops within the stone. Linked to the heart, stomach and digestion, it stimulates the glands and regulates the acids and enzymes in the metabolism. It helps heal a broken heart and restores harmony.
Opal: " For in them you shall see the living fire of the ruby, the glorious purple of the amethyst, the sea-green of the emerald, all glittering together in an incredible mixture of light." ~ Roman Pliny the Elder on Opal, Century AD--iridescence