heulandite
/ˈhjuːləndaɪt/
noun
- A common mineral found in volcanic rocks, usually in the form of shiny, glassy crystals that can be white, pink, or brown.
- The museum displayed a beautiful piece of heulandite from Iceland.
- He found a small cluster of heulandite crystals while hiking near the old volcano.
- Collectors prize heulandite for its delicate, pearl-like luster.