pseudomorph

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pseudomorph

[′süd·ə‚mȯrf]
(mineralogy)
An altered mineral whose crystal form has the outward appearance of another mineral species. Also known as false form.
References in periodicals archive ?
Along the edge of the kaolinite adjacent to a quartz grain towards the lower left-side of the field-of-view, smectite is pseudomorphing a fragment of volcanic glass.
In the case of the former process, the evidence for partial pseudomorphing of grains in both the sandstone and saprolite suggests that this process is contemporary, and is occurring through weathering of the sandstone under nearsurface conditions.