Glassy Form of Opal
This page is the CodyCross answer for the clue below from Deserts of the world, Group 1616, Puzzle 4 (Dune Bashing).
Question is: Glassy Form of Opal
and the answer is: HYALITE
Word Meaning:
HYALITE — (mineralogy) A form of opal.
Definitions from Wiktionary.