Gemini's Brightest Star and Castor's Twin Brother
This page is the CodyCross answer for the clue below from Renaissance, Group 1393, Puzzle 5 (Hardwick Hall).
Question is: Gemini's Brightest Star and Castor's Twin Brother
and the answer is: POLLUX
Word Meaning:
POLLUX — (mineralogy) A variety of petalite always found with castor.
Definitions from Wiktionary.