Geode Crystal Break Your Own, DIY Unopened Quartz Geodes, Gift for Children Surprise Mystery Crystals. Crack your geode to reveal a crystal surprise! Opening your geode is a fun activity for all! Crack to see magical and sparkling crystals appear inside. Inspired by customer requests, our crack-your-own geode crystal is here! You never know what is inside, it can be quartz, amethyst, agate, or calcite. Capture the moment as you uncover your geode to see if you contained an amethyst crystal, quartz crystal, dolomite, or some other unknown stone. The perfect activity for kids or children who are curious. Also great for anyone who loves crystals because cracking geodes is always a fun surprise!