Last Updated
：2025/11/26
boulder opal
Noun
countable
uncountable
Japanese Meaning
暗いシリカ質の鉄岩マトリックス内に存在する、塊状集合体および割れ目充填物からなるオパール
（ plural ）
Quizzes for review
An opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.
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boulder opal
The museum's new display featured a rare boulder opal that shimmered with flashes of blue and green.
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The museum's new display featured a rare boulder opal that shimmered with flashes of blue and green.
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