Crystal Used in Watches
This page is the CodyCross answer for the clue below from Paris, Group 248, Puzzle 1 (Rue Des Barres).
Question
Crystal Used in Watches
Answer
QUARTZ
Word Meaning:
QUARTZ — (mineralogy) The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO₂. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.
Definitions from Wiktionary.