OMIKO on Instagram: "This stunning geode is a naturally occurring rock formation that formed over millions of years. Geodes begin as hollow cavities in volcanic or sedimentary rocks, often created by gas bubbles or organic material. Over time, mineral-rich water seeps into these cavities, depositing layers of crystals that slowly grow inward, forming the sparkling interior seen when the rock is cracked open. The vibrant colors and crystal structures vary depending on the minerals present—common