Gemstone formed from silica (4)
Crossword clue · 1 known answers · 1 appearances · Last seen in the The Guardian crossword on May 30, 2026
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OPAL
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About this clue
The clue “Gemstone formed from silica (4)” has appeared 1 times in our database with 1 different answers, so count the squares in your grid and check the crossings before you commit. Most recently it ran in the The Guardian crossword on May 30, 2026, where the answer was OPAL.
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