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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 ?
The most important physical properties of phyllosilicates and their fine-grained aggregates reflected during the transportation and settling are as follows: a) good cleavage of crystals, b) easy separability of small particles from clay pseudomorphs and fragments of aggregates of bedded, fissile or foliated argillaceous rocks rich in phyllosilicates, but mainly c) their relatively low hardness in relation to other common rock-forming minerals and rock fragments co-transported in streams.
Most or all of the crystals are probably partial pseudomorphs of calcite after witherite.
Braunite occurs in good crystals in the manganese deposit at Ohrenstock near Ilmenau, in the Thuringian Forest about 100 km south of Ilfeld, but in the Ilfeld manganese veins it did not form good macrospecimens--lustrous crystals to 5 mm have been noted rarely, and braunite pseudomorphs after manganite occasionally have appeared (www.
However, subsoils formed in saprolite may contain fragile pseudomorphs of primary minerals resulting in minor fabric alteration by ripping.
The Eel Bed of the Kokomo Limestone contains sedimentary structures that include bird's-eye (fenestrate) structures, algal mats, gypsum/anhydrite blebs and pseudomorphs, penecontemporaneous dolomite, and intraformational storm tide deposits, that we interpret as indicative of a supratidal (Shinn 1983; Hardie & Shinn 1986) depositional environment.
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.
Both sphalerite and quartz form pseudomorphs after euhedral prismatic barite crystals.
Other samples were then found to contain myocardial cells with pseudomorphs of mitochondria, heart-muscle fiber, intercalated disks, and both epicardial and pericardial wall material.
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.