153 reactions · 5 comments | Chocolate opals form as nodules in a tough host rock—often cracked open like geodes. While striking, they’re less stable than jewelry-grade opals and can craze after polishing or in dry heat. They’re ideal for display without needing to be keep wet like specimen-grade opals. ✨ . . . . . #gemstones #opals #nature #geology #minerals | Opal Trove | Facebook
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