pipe opal

noun

Opal formed in an unusual tubular shape, mainly in sandstone.

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Meanings

nounpipe opal (countable and uncountable, plural pipe opals)

plural pipe opals

  1. countableuncountablechemistryOpal formed in an unusual tubular shape, mainly in sandstone.
Cite this entry
APA

pipe opal. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/pipe%20opal

MLA

“pipe opal.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pipe%20opal. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “pipe opal,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/pipe%20opal.

Source: pipe opal on Wiktionary, CC BY-SA 4.0.