From Wiktionary, the free dictionary
Čejka + -ite, From the surname of Dr. Jiří Čejka, a Czech mineralogist
cejkaite
- (mineralogy) A triclinic mineral containing carbon, iron, magnesium, oxygen, sodium, and uranium.
- David Barthelmy (1997–2025) “Cejkaite”, in Webmineral Mineralogy Database.