wood opal

British

noun

a form of petrified wood impregnated by common opal

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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wood opal

The first table contains a very attractive collection of minerals, including the varieties of jasper; all kinds of opals—the sun opal, the semi-opal, wood opal, and wood partially opalised.

From How to See the British Museum in Four Visits by W. Blanchard Jerrold

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023