richterite
/ˈrɪktərʌɪt/Mineralogy
noun
A ferromagnesian mineral of the amphibole group, occurring as elongated brown, yellow, red, or green crystals.
- Richterite is a silicate of sodium, calcium, magnesium, and (usually) iron (ii), Na2Ca(Mg,Fe)5Si8O22(OH)2; it was formerly thought to contain manganese. Crystal system: monoclinic..
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From the name of H. Theodor Richter, German metallurgical chemist + -ite, after German Richterit.