A plain grey rock worth over $500 — if you know what to look for. Sodalite Dragon Egg rocks look completely ordinary under normal light but glow brilliant orange-red under UV light due to fluorescent minerals locked inside. Found along the Lake Superior shoreline on the US-Canada border, individual pieces sell for $555 and experienced collectors pocket thousands in a single day. Most people walk right past them because without a UV light, they're completely invisible. The stones aren't rare — the knowledge is.
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