What does the cryptic crossword clue "Zinc or rocky mineral in crystal form (6)" mean?

The definition is "mineral in crystal form". The wordplay uses an anagram. anagram of ZINCOR ("Zinc or") [anagram: "rocky"] = ZIRCON; definition: "mineral in crystal form" The answer is ZIRCON.

Zinc or rocky mineral in crystal form (6)

Guardian Cryptic #27674 | 12 Across | 2018-11-23 flower

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