adjective
- (of a mineral crystal) having its own characteristic shape; bounded by its own natural faces.
Usage: mineralogy; geology
Examples
- The quartz crystals in the granite were idiomorphic, displaying well-defined hexagonal faces.
- Geologists identified the mineral as idiomorphic feldspar based on its perfect crystal boundaries.
- In thin section, the idiomorphic garnets stood out against the surrounding matrix.
- The specimen showed idiomorphic pyrite cubes that had formed without external constraints.