Last Updated
：2025/11/20
opal
IPA(Pronunciation)
Sense（1）
Sense（2）
Sense（3）
Sense（4）
（ plural ）
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(mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O.
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opal
She examined the opal under a magnifying glass, noting the play of colors and its relatively low hardness compared to quartz.
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She examined the opal under a magnifying glass, noting the play of colors and its relatively low hardness compared to quartz.
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