Where does “χαλαζίας” come from?

χαλαζίας (Greek) comes from Ancient Greek χάλαζα, from Proto-Indo-European gʰlh₂-d- — hail; hoarfrost.

χαλαζίας (Greek): quartz

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	χάλαζα	hail, sleet; pimple, tubercle; knot, lump
2	Proto-Indo-European	gʰlh₂-d-	hail; hoarfrost

χαλαζίας — Etymology, Origin & Word History | Etymology Explorer