Spherulites are small, rounded formations found in rocks or minerals.
Spherulites are interesting because they are like little balls inside rocks.
Examples:
The geologist found spherulites in the rock.
The spherulites in the mineral were very pretty.
I saw spherulites in the stone I found.
The spherulites looked like tiny planets in the rock.
The spherulites were like little surprises inside the stone.
The spherulites in the rock were like a secret treasure.