Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?
Some people make an annual excursion to the San Diego County Fair to eat the fabulous food. Others come to see the adorable animals. But San Diego resident Bill Lawson makes the pilgrimage for rocks.
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