Amethyst Birthstones Gems Geology & Soils On The Internet Sources School Of Organic Sources University Of Nebraska Lincol
Brazil and Uruguay crystals lining substantial geodes within ancient basaltic lava flows. These cavities are old gas bubbles which, over time and circulations of hydrothermal fluids led to the crystallization of amethyst geodes that can occasionally exceed ten meters ! Silica present in option in these warm waters has resulted in the formation of crystals, some of which exceed 15 cm. Saturation When pondering about saturation assume the brightness of the hue. In spite of getting page a purple colour,…