...Fig. 5 - A) Outcrop of the poorly cemented sandstone of the middle member of the Laga fm. containing spheroidal botroids (protruding sandstone concretions), as exposed along the road at the southern foot of Colle Pietro (see Fig. 1 for location); B) The Esinante Creek completely dry...

... aggregate comprising cement, veins and botroidal encrustations. Irrespective of its spatial, temporal and paragenetic position, it invariably registers weak to moderate radioactivity, due to the presence of uranium within it, as is evident from microprobe data. Although intra-grain and inter-grain...

...Fig.4. (a). Field photograph is showing intergrowth of botroids or colloform structures in Sonia sandstone. (b). Field photograph showing botroidal shape or forms vanadium mineralization deposited by epithermal solutions. (c). Field photograph showing vertical movement of mineralizing...

... are postdated by botroidal silicifications of quartzine-lutecite. (C) Same as B. Note that cone-in-cone nested discontinuities diverge from sites with clay impurities and that the botroidal silicifications replace the fibrous structure of the vein, which is still recognizable as a ghost feature. (D) Augmented...

... Botroidal nodules in copper clay matrix 25.08 –10.74 0.38 25 NWX-8 Azurite N15980/W13880; 4,675 177 82 Botroidal nodules in copper clay matrix 24.96 –10.61 0.34 25 NWX-9 Azurite N15200/W14050; 4,900 69 146 From 17-mm-thick azurite vein 23.26 –9.68 0.05 34...

...) with variable quantities of pyrite, sphalerite, chalcopyrite, galena, acanthite, and gold, locally attaining 20% in volume. The main primary textures in the veins are comb, crustiform, and botroidal. The third stage of mineralization occurs as veins (<35 cm thick) and cementing fragments of previous...

... traces of the vital activity of marine organisms) is relatively planar or concave, which is best seen in its central zone, where a pebble core, usually with a thin ore crust, is localized. The lower surface is lighter, of botroidal (small-tubercular) texture. The edges have a thin rim of ore substance...

... Pb 13 13 7 8 18 15 14 * Analyses by XRF. This work was supported by Consejo Nacional de Tecnologia, CONACYT, Project D47075F. High-resolution scanning electron microscopy (HRSEM) of the tuff shows silica glass spherules of ~70 μm diameter with a rough botroidal crustal...

... textures of Roman slag samples; ( d ) fayalite crystals in a matrix of quartz and glass in a Roman slag sample; ( e ) skeletal fayalite crystals in a modern slag; ( f ) detail of the previous figure; ( g ) view of a botroidal growth of iron oxide crystals in a Roman slag; ( h ) jarosite needle growth...

... is too fine-grained to identify. The samples often have amygdales with diameters up to 1 mm. The amygdales are commonly filled with clear minerals in the core, probably agate and/or chalcedony and radiating green brown botroidal minerals around the rim, possibly prehnite or zeolites. Major...

... intraclasts (to left) and spherule with botroidal rim and irregularly shaped central spot (to right) from Jeerinah layer. Scale bar is 150 μm long. ( F ) Untwinned feldspar grain with mottled extinction and irregularly distributed inclusions from Jeerinah layer. Thin bright lines in upper middle part...

... the subspherical diatom-rich aggregates (some of them highlighted in red, E) that are common in the granular diatom-rich lamina and represent entombed diatom–bacteria aggregates. F) Detail of Rivularia -like filaments encrusted on sparry laminae represented by translucent stacked botroidal crystals (sb). G...

... Mineralogie Abhandlungen , 148 / 3 , 329 – 336 . Cabral , A.R. , Lehmann , B. , Tupinambà , M. , Schlosser , S. , Kwitko-Ribeiro , R. and Abreu , F.R. ( 2009 ) The platiniferous Au-Pd belt of Minas Gerais, Brazil, and genesis of its botroidal Pt-Pd aggregates . Economic...

... ± (Qz, Anh) Mol ± (Cp) None None Chlorite-epidote Very rare Irregular 1–3 Chl, Ep, Act, Cal Py 0.5–2 Ab Calcite Very rare Irregular 1–2 ± (Clays) ± (Py) None None Gray-banded quartz Rare Irregular 2–20 Botroidal Qz ± (Cp, Mol) None None See Table 1 for mineral...