potch

(redirected from potch opal)

potch

(pɒtʃ)
n
(Jewellery) chiefly slang Austral inferior quality opal used in jewellery for mounting precious opals
[C20: of uncertain origin]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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The second process dominates in water-rich precious and potch opals that do not exhibit any crystallinity according to XrD analysis.
Studies of superlattice structure of opals as compared to other rocks by use of positron annihilation, x-ray powder diffraction and scanning electron microscopy methods

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