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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.


(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


(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.
References in periodicals archive ?
SEM analysis was conducted on the fragile ashy pseudomorphs of macrofossils of grasses which remained visible inside the charred dung remains (Figure 2e).
The expanded study of textile imprints and pseudomorphs also contributes to our understanding of ancient textiles, as do new analytical methods and scientific analyses.
Iron oxide pseudomorphs after chalcopyrite make Emu Plain an exciting drill target.
Warren, personal communication, 2007), and pseudomorphs preserved in local strata demonstrate that evaporates precipitated within the Hartford Basin (Gierlowski-Kordesch 1985; Demicco and Gierlowski-Kordesch 1986; Olsen et al.
The sills contain small pseudomorphs of olivine, plus plagioclase and clinopyroxene phenocrysts.
Chemical weathering of plagioclase, alkali feldspar, and biotite has formed kaolin which mostly occurs as an anisotropic matrix which pseudomorphs primary minerals (Fig.
Microscopic supporting evidence includes microcracks, intraformational micro-breccia/conglomerate, an abundance of dolomite, anhydrite/gypsum pseudomorphs, and fenestrate structures lined with calcite, dolomite and tar.
Baculi can be regarded as original structures (our preferred interpretation) or as pseudomorphs formed during the earliest stages of fossilization (e.
The presence of platy goethite pseudomorphs and platy leach casts after pyrrhotite provide important evidence for the origin of Okorusu fluorite orebodies by the replacement of pegmatitic carbonatite.
The rock contains pseudomorphs after olivine-I, laths of mica and large (2-3 mm) picroilmenite grains which, according to the microprobe analysis, are chemically identical to earlier identified kimberlitic picroilmenite.
Bright yellow, highly birefringent smectite forms argillan rims around the mineralogically stable epiclastic grains (mainly quartz) and pseudomorphs them.
The eastern dyke is alkalic, and contains pseudomorphs of olivine phenocrysts in a fine-grained groundmass of plagioclase, brown amphibole, and pyroxene.