How Is Opal Formed? The Science Behind Its Colors

How is opal formed? It begins when water carrying dissolved silica moves through cracks, cavities and other open spaces in rock. Over time, the water evaporates or drains away, leaving behind silica that can harden into one of the world’s most unusual gemstones. Twist a precious opal in your hand and you may see flashes […] The post How Is Opal Formed? The Science Behind Its Colors first appeared…