pisolitic structure

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Microspherulite — Microspherulites are microscopic spherical particles with < 2 mm diameters, usually in the 100 micrometre range, mainly consisting of mineral material (the Greek litos means stone ). Only bodies created by natural physico chemical… … Wikipedia
Pisolite — A pisolite is a sedimentary rock formed from pisoliths. These are concretions often of calcium carbonate, but commonly in rarer minerals which resemble ooids.These grains are approximately spherical, and comprise concentric layers reaching 5 8 mm … Wikipedia
bauxite — bauxitic /bawk sit ik, boh zit /, adj. /bawk suyt, boh zuyt/, n. a rock consisting of aluminum oxides and hydroxides with various impurities: the principal ore of aluminum. [1860 65; named after Les Baux, near Arles in S France; see ITE1] * * *… … Universalium
Banksia cuneata — Conservation status … Wikipedia
Western Africa — ▪ region, Africa Introduction region lying south of the Sahara and east and north of the Atlantic Ocean. It is latitudinally divided into two parallel belts of land: the western portion of the Sudan, a geographic area that stretches across… … Universalium

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