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1. A false, deceptive, or irregular form.
2. A mineral that has the crystalline form of another mineral rather than the form normally characteristic of its own composition.

pseu′do·mor′phic, pseu′do·mor′phous adj.
pseu′do·mor′phism n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Minerals) a mineral that has an uncharacteristic crystalline form as a result of assuming the shape of another mineral that it has replaced
ˌpseudoˈmorphic, ˌpseudoˈmorphous adj
ˌpseudoˈmorphism n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈsu dəˌmɔrf)

1. an irregular or unclassifiable form.
2. a mineral having the outward appearance of another mineral that it has replaced.
pseu`do•mor′phic, pseu`do•mor′phous, adj.
pseu`do•mor′phism, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
The demineralization of conodont elements yields a protein 'pseudomorph' possessing the same size and shape as the original element.
Right: Christodoulos Panayiotou, Untitled, 2017, Amarelo Vila Real granite, various pseudomorph minerals, 18-karat yellow gold, 18-karat white gold, silver, waxed polyester thread, paulownia, leather and leatherette boxes.
Shattuckite was discovered in Bisbee, Arizona, USA (Shattuck mine) as a pseudomorph after malachite (Schaller, 1915).
At places the complete transformation of hornblende to chlorite is visible in the form of pseudomorph left after hornblende.
The combination of these two secretions is thought to allow squid to produce ink of various consistencies, ranging from a diffuse cloud to a substantive pseudomorph (Boletsky, 1997; Young and Mangold, 2000; Bush and Robison, 2007).
Even more importantly, the existence of science fiction metal and the way this music reformats and recycles the genre's codes compels us to recognize that, just as Brooks Landon identified science fiction film to be literary sf's pseudomorph, various other sf media which are not primarily narrative--music, art, videogames--are even more pseudomorphic.
In fact, tiger's-eye is cited in many textbooks as a classic example of a pseudomorph, says Peter J.
Others are bioluminescent and "glow-in-the-dark." They also have the ability to excrete an ink cloud, called a pseudomorph, which resembles a squid's shape.
This cubic morphology of primary jarosite does not necessarily mean a pseudomorph transformation from pyrite, since they have the same crystal habit.
Ink Release is observed in several forms: (a) a cloud (n = 25), either diffuse or of interconnecting ink blobs, (b) a single pseudomorph (n = 9) or two or more consecutive pseudomorphs (n = 2) that hold their shape, (c) a diffuse puff (n = 6), (d) a long slender rope (n = 2), (e) a short, thin string (n = 2), and (f) alternating with defecation (n = 1).