granophyres
/ˈɡrænəˌfaɪərz/
noun
- Plural of granophyre; multiple instances or types of this fine-grained igneous rock.
- Collectors seek out rare granophyres from volcanic areas.
- The region is known for its colorful granophyres, which vary in mineral content.
- The museum display includes granophyres from different geological periods.