pumpellyite
/pʌmˈpɛlɪʌɪt/Mineralogy
noun
A mineral, or group of minerals resembling epidote in structure, which occur as colourless, greenish, or brown crystals and are characteristic of some low-grade metamorphic rocks.
- Pumpellyites are hydrated calcium aluminosilicates also containing varying proportions of magnesium, iron, and/or manganese. Crystal system: monoclinic..
Origin
1920s. From the name of Raphael Pumpelly, U.S. geologist + -ite.