potch
Speech parts
1. potch - Noun
2. potch - Verb
Meaning
To thrust; to push.
See Poach, to cook.
Source: Webster's dictionarySynonyms
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An opal doublet consists of a relatively thin layer of precious opal, backed by a layer of dark-colored material, most commonly ironstone, dark or black common opal (potch), onyx, or obsidian.
Contrarily, opalescence is correctly applied to the milky, turbid appearance of common or potch opal.
These include: casting, faceting, carving, jewelry, mosaics (e.g. little slices of opal on potch, obsidian or another black stone and with a clear dome (glass or crystal quartz) on top.