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geode
This term describes a specific geological formation where the exterior is a plain, unremarkable stone, while the interior contains a hidden crystalline cavity. It evokes a sense of discovery and contrast between a rugged outer shell and a fragile, sparkling core.
In a scientific context, it is used precisely to distinguish these hollow nodules from solid mineral masses or veins. Because it refers to a discrete physical object, it follows standard English countability rules for tangible items.
Meanings
Examples
The geologist carefully cracked open the geode to reveal the amethyst crystals inside.
It looks like a plain gray rock on the outside but it is actually a geode.
I wonder if this stone is just a pebble or a geode.
The dragon guarded a hoard of gold and shimmering geodes.
We learned about how a geode forms when mineral rich water fills a cavity in volcanic rock.
She keeps a polished geode on her desk for decoration.