Where does “selenite” come from?

selenite (Italian) comes from Latin selēnītēs, from Ancient Greek σεληνῑ́της, from Ancient Greek σελήνη, from Ancient Greek Σέλας.

selenite (Italian): moonstone; selenite

Definitions

Step	Language	Word	Meaning
1	Latin	selēnītēs	—
2	Ancient Greek	σεληνῑ́της	moonstone
3	Ancient Greek	σελήνη	moon; month; a moon-shaped cake
4	Ancient Greek	Σέλας	—

selenite — Etymology, Origin & Word History | Etymology Explorer