boulder opals

A form of boulder opal — An opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.

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Meanings

noun
  1. pluralplural of boulder opal
Cite this entry
APA

boulder opals. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/boulder%20opals

MLA

“boulder opals.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/boulder%20opals. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “boulder opals,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/boulder%20opals.

Source: boulder opals on Wiktionary, CC BY-SA 4.0.