pseudomorph

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pseu·do·morph

(sū'dō-mōrf),
A mineral found crystallized in a form that is not proper to it but to some other mineral.
[pseudo- + G. morphē, form]
References in periodicals archive ?
Under PPL, the outlines of former grains that have been pseudomorphed by smectite are evident in the centre of the field-of-view in Fig.
Several grains that have been pseudomorphed by smectite to form the clay matrix are indicated by the white arrows in Fig.
All gradations exist between samples with relict primary clinopyroxene (augite), partially pseudomorphed by actinolite, and accompanied by the remainder of the lower grade assemblages described above, to assemblages with actinolite pseudomorphs exhibiting well-developed blue-green hornblende rims with or without relict pyroxene.
2 cm have been observed, often pseudomorphed to malachite.
Finally, chalcopyrite occurs in mammillary, dark bronze-brown "blister" specimens, which may be pseudomorphed to bornite, which in turn may show later sprinklings of brilliant black pseudohexagonal chalcocite crystals.