septarian
/sɛpˈtɛriən/
adjective
- Describing a type of rock nodule that has internal cracks filled with minerals, forming a pattern like a turtle shell.
- Rock collectors often look for septarian nodules because of their unique cracked patterns.
- Septarian stones are sometimes polished and used as decorative objects.
- The museum displayed a beautiful septarian geode with yellow calcite crystals.