ripidolite
/rɪˈpɪdəlʌɪt/Mineralogy
noun
A mineral of the chlorite group with fan-like crystals, now regarded as a ferroan variety of clinochlore.
- Chemical formula: (Mg,Fe,Al)6(Si,Al)4)10(OH)8..
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From French ripidolite or its etymon German Ripidolith from ancient Greek ῥιπίδ-, ῥιπίς fan + German -o- + -lith.