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 ?
1974) observed the process of oxidation of pyrite from the outer edge to the inside of the framboids, noting that the first products are poorly crystalline iron oxyhydroxide hypocoatings and pseudomorphs after pyrite framboids, which sometimes have a remnant nucleus of pyrite.
1750-1100 BC, as evidenced by microscopic examination of silk fibres in textile pseudomorphs (mineralizations of former textiles) adhering to Shang period bronzes (Kuhn 1982: 383-6).
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.