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Meaning of boulder opal | Babel Free

Noun CEFR B2

Definitions

An opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.

countable, uncountable

CEFR level

B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

Bouldered boulderer bouldering Boulderite Boulders boulderstone

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