Castor's Twin Brother in Greek Legend
This page is the CodyCross answer for the clue below from Prehistory, Group 1251, Puzzle 1 (Mesopotamia).
Question is: Castor's Twin Brother in Greek Legend
and the answer is: POLLUX
Word Meaning:
POLLUX — (mineralogy) A variety of petalite always found with castor.
Definitions from Wiktionary.