boulder opal
noun1
An opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.
- Hyponyms
- Yowah nut
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
noun
An opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
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