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boulder opal
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English
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Noun
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boulder
opal
(
countable
and
uncountable
,
plural
boulder opals
)
An
opal
consisting of
concretions
and
fracture
fillings
in a dark
siliceous
ironstone
matrix
.
Hyponyms
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Yowah nut
Categories
:
English lemmas
English nouns
English uncountable nouns
English countable nouns
English multiword terms