OPAL


OPAL


This is a 4 letter answer

Dictionary definitions:


Word: opal
Phonetic: /ˈəʊpəl/
Listen:

A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.
A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."
Any of various lycaenid butterflies of the genus Nesolycaena.


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Gem



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