noun
- plural of cleveite; a rare black or dark brown mineral containing uranium and thorium, used as a source of radioactive elements.
Usage: mineralogy; technical; plural form
Examples
- Cleveites were among the first minerals studied for their radioactive properties.
- The museum's collection includes several specimens of cleveites from Scandinavia.
- Researchers analyzed cleveites to extract uranium and thorium in early nuclear research.
- Cleveites are relatively rare and highly valued by mineral collectors.