noun
- Plural of euclase; a rare, hard, transparent or translucent mineral, typically blue or green, used as a gemstone.
Usage: mineralogy; gemology
Examples
- The museum's mineral collection includes several fine specimens of euclases from Brazil.
- Euclases are prized by collectors for their brilliant clarity and vivid coloring.
- The jeweler examined the euclases under magnification to assess their quality.
- Euclases are much rarer than quartz or feldspar in most geological formations.