atelestite
/əˈtɛləstʌɪt/ /atəˈlɛstʌɪt/(also atelesite) Mineralogy
noun
A rare mineral found in deposits of bismuth- and arsenic-bearing minerals and typically occurring as yellowish or green botryoidal aggregates.
- Atelestite is an arsenate of bismuth, Bi8(AsO4)3(OH)5O5. Crystal system: monoclinic..
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From German Atelestit from ancient Greek ἀτέλεστος without end, unaccomplished + German -it, with remodelling of the ending after -ite; perhaps so called with allusion to the unknown composition of the mineral when it was first described.