 | | Journal (article/letter/editorial) | | petrified stems, silicified wood, silica texture, α-quartz, chalcedony, cathodoluminescence microscopy, imaging...popular in studies of siliceous materials such as quartz and agates (e.g. Ramseyer et al., 1988; Watt et...the nature and distribution of luminescence in quartz, which may reflect specific conditions during its...Zimmerle, 2000; Boggs et al., 2002). The CL of quartz is often used in provenance analysis to distinguish... 218 P. Matysová, J. Leichmann, T. Grygar, R. Rössler Fig. 1. Location of the Bohemian Massif with the |  | | Book | | deformed equivalent of the Říčany Granite), Chleby Quartz Diorite (small bodies). Size and shape (in erosion...19 – faults, Pe – Pecerady Gabbro, Z – Zálužany Quartz monzonite, Zb – Zbonín Granite, KH – Kosova Hora...Trondhjemite 351 ± 11 Ma (Pb-Pb zircon), Vrančice Quartz diorite 342 ± 4 Ma (Ar-Ar hornblende), Klatovy...(Svoboda et al. 1964) 1 – Sázava Tonalite, Bohutín Quartz diorite, Těchnice Granodiorite. 2 – Blatná, Červená...Požáry Trondhjemite, Blatná Granodiorite and Něčín Quartz diorite, 2 – Tábor Melasyenite, Čertovo břemeno |  | Götze, Jens, Pan, Yuanming, Stevens-Kalceff, Marion, Kempe, Ulf, Müller, Axel (2015) Origin and significance of the yellow cathodoluminescence (CL) of quartz. American Mineralogist, 100 (7) 1469-1482 doi:10.2138/am-2015-5072 | Journal (article/letter/editorial) | | significance of the yellow cathodoluminescence (CL) of quartz Jens Götze1,*, Yuanming Pan2, Marion Stevens-Kalceff3...The origin of yellow cathodoluminescence (CL) in quartz has been investigated by a combination of CL microscopy...oxygen deficiency and local structural disorder in quartz. A proposed luminescence center model implies self-trapped...(STE) emission from localized amorphized regions in quartz. Although the high-intensity emission at 570 nm... The evaluation of geochemical data shows that quartz with yellow CL occurs in low-temperature hydrothermal |  | | Journal (article/letter/editorial) | | precipitation may produce opal, chalcedony, and quartz as deposits within a single cavity. Silica polymorphs... In Nevada, specimens that contain crystalline quartz, this mineral appears to have been formed by direct...Keywords: petrified wood; silica; opal; chalcedony; quartz; paleobotany; Nevada Geosciences 2015, 5 287...invariably contain cryptocrystalline or microcrystalline quartz as the principal components, in contrast to opal...Chalcedony opal-CT, chalcedony, quartz opal-A opal-CT opal-CT, quartz. Chalcedony Chalcedony Chalcedony |  | | Journal (article/letter/editorial) | | metastable β-crystobalite and reordered opal-CT → quartz. The moganite in the samples indicates a potential...opal-A → opal-CT, opal-A → cuboid quartz (pseudocubic) and opal-CT → quartz. Certain stages of silica transformation...transform to the high crystallinity of prismatic quartz through a solid-state mechanism. The results provide...insights into the petrified wood genesis in the region. Thermal inputs into the silicification process...post-volcanic hydrothermal fluids, producing mainly quartz, sometimes with metastable silica polymorphs such |  | | Journal (article/letter/editorial) | | 2012 Accepted 18 July 2012 Keywords: Agate Silica Quartz Alteration Chemical transport reactions a b s...mixture of certain SiO2 polymorphs and morphological quartz varieties (e.g., Heaney, 1993; Graetsch, 1994;...elements in the host rock and different chalcedony and quartz layers within an agate from St. Egidien, Germany...these elements could be higher in macrocrystalline quartz compared to chalcedony (Fig. 1). Moreover, the...the concentrations of these elements in quartz/chalcedony (e.g., Ge 10.4 ppm, U 17.1 ppm, B 33 ppm – see |  | Götze, Jens, Schertl, Hans-Peter, Neuser, Rolf D., Kempe, Ulf, Hanchar, John M. (2013) Optical microscope-cathodoluminescence (OM–CL) imaging as a powerful tool to reveal internal textures of minerals. Mineralogy and Petrology, 107 (3) 373-392 doi:10.1007/s00710-012-0256-0 | Journal (article/letter/editorial) | | (e.g. scheelite) and silicates (e.g., feldspar, quartz, zircon, kaolinite, forsterite, willemite, wollastonite...different minerals; a Different SiO2 phases (qtz-quartz, cs-coesite, cha-chalcedony) in a pyrope quartzite...a/b Distinct oscillatory zoning in a hydrothermal quartz crystal from Matras, Hungary (b—CL), which is not...visible in polarized light microscopy (a—Pol); c/d Quartz in an agate from St. Egidien, Germany appearing...of Mn2+ incorporation; f Synthetic hydrothermal quartz, which appears homogeneous in polarized light but |  | | Journal (article/letter/editorial) | | well-known example of anomalous compression behaviour is quartz (Adams et al. 1919; Bridgman 1925). Similar observations...130 GPa and a poisson ratio of 0.18 (Madelung, Rössler, Schulz 1999). For polycrystalline ceramic material—as...by a double line. Also the onset of the S-wave region has been marked by a double line. Its position...calculated which is representative for the P- and S-wave region—displayed here: Pav-WC, and SavWC. The same average...a WC calibration run for the P-wave and S-wave region (details see text). b By calculating the difference |  | | Journal (article/letter/editorial) | | Although the Pb isotopic ratios of calcite and quartz coexisting with illite indicate the formation age...contrast with low contents of Ba in calcite and quartz (b 0.26 ppm). Considering the chemical similarity...mainly consist of quartz. Fine calcite veins with 0.1 to 2 mm width are found in the quartz matrix. Small...minerals are mainly quartz. Calcite fills the fractures and forms veins in quartz. Fine illite grains...normalized to the ion count rates of Si2O3+ for quartz and illite, and of Ca3(CO2)2+ for calcite. SRM610 |  | | Journal (article/letter/editorial) | | Mineral concentrates from three samples from the quarry Kesselhöhe (to the west of Bärenstein). Degassing...correspond to the Carboniferous sediments found in a quarry to the north of Mikulov (Westphalian C/D; BREITER...SELTMANN 2005). Resorption textures on feldspar and quartz and the mantling of Kfeldspar with plagioclase...rich in phenocrysts of K-feldspar and subordinate quartz. This type correlates with the central part of...and dating, the dike was sampled in an abandoned quarry (active in the beginning of the 20th century) near |  | | Journal (article/letter/editorial) | | granitepegmatite-greisen system recorded by trace elements in quartz: Krupka district, Eastern Krušné hory/Erzgebirge...granite-pegmatite-greisen system recorded by trace elements in quartz: Krupka district, Eastern Krušné hory/Erzgebirge...granite-pegmatite-greisen system recorded by trace elements in quartz: Krupka district, Eastern Krušné hory/Erzgebirge...Li-F-rich granites through pegmatites, greisens and quartz veins in a composite stock at Knöttel in the Krupka...range) by monitoring trace-element variations in quartz. Interelemental correlations reveal Si4+ ↔ Li+Al3+ |  | | Journal (article/letter/editorial) | | silicification; fossil wood; opal-A; opal-CT; chalcedony; quartz 1. Introduction Citation: Mustoe, G.E. Silicification...crystallization (opal-C/opal-CT); microcrystalline quartz (chalcedony) is considered to be the result of...near-neutral pH, the equilibrium solubility of quartz is only 6 ppm (calculated as SiO2 ). In contrast...may occur in a variety of lattice arrangements. Quartz, the hexagonal version, is by far the most familiar...suggests that they originate fromtransformation of quartz. The physical chemistry has been interpreted in |  | | Journal (article/letter/editorial) | | within the Neoproterozoic rocks. Five generations of quartz veins, referred to as Q0 through Q4 were distinguished:...veins its culmination and Q3 veins its fading. Late quartz gangue (Q 4) is associated with uneconomic Ag–Pb–Zn...vein-type ores hosted by calcite–barite–(quartz) veins. Quartz vein thickness (~0.3 to ~300 mm), spacing...analogous to the J1 joints prior to the formation of quartz veins. The formation of the Q1–2 veins at the Mokrsko-East...“sheeted veins”, a system of parallel (stacked) quartz veins, usually 1–20 cm wide, moderately to widely |  | | Journal (article/letter/editorial) | | polymorphs of silica: opal-A, opal-C, chalcedony, and quartz. Less familiar are fossil woods preserved with...occurrences are emphasized simply because it is the region most familiar to the author. The terminology “petrified...this report range from dolomite wood that contains quartz-filled fractures (Washington, USA) to silicified...in the wood are commonly filled with crystalline quartz that precipitated Dolomitization of wood is rare...in the wood are commonly filled with crystalline quartz that precipitated during a later phase of mineralization |  | Danisi, R. M., Armbruster, T., Lazic, B., Vulic, P., Kaindl, R., Dimitrijevic, R., Kahlenberg, V. (2013) In situ dehydration behavior of veszelyite (Cu,Zn)2Zn(PO4)(OH)3·2H2O: A single-crystal X-ray study. American Mineralogist, 98 (7) 1261-1269 doi:10.2138/am.2013.4465 | Journal (article/letter/editorial) | | structural study and mounted in an open 0.1 mm diameter quartz-glass capillary. Single-crystal X‑ray diffraction...of hydrogen bonds (Table 5). The O-H stretching region in the wavelength range 4000 to 3000 cm–1 of the...in Figure 4. The large number of bands in this region can be assigned to stretching vibrations of hydroxyl... (1954) Chemical analyses of Japanese minerals (III). Journal of the DANISI ET AL.: IN SITU DEHYDRATION..., Tessadri, R., Többens, D.M., Wertl, W., and Rössler, A. (2008) Mg[ZnPO4(H2O)]2⋅10H2O—a layered hydrous |  | | Journal (article/letter/editorial) | | sandstone uraninite ε-particle illite, calcite, quartz uraninite, phosphate uraninite uraninite uraninite...calcite veins with a width of 0.1–0.2 mm in the quartz matrix (Figure 1). As the result of the systematic...isotopic study of this sample, the data on calcite and quartz coexisting with illite indicate the formation age...diagram between Ba elemental It is reasonable to quartz consider(0.025~0.26 that the enrichment of 2062Pbshows...abundances andofPb isotopic in the illite, calcite and quartz from one of drifts, selective uptake Ra on theratios |  | | Report (chapter) | | correlation, comparison and significance Ronny Rössler Geological Society, London, Special Publications...subsequently led to several generations of dense quartz polymorphs (Witke et al. 2004). This may have happened...preserved in fine-grained overbank deposits, Filadelfia region, 2005. (d) Arthropitys-type calamite trunk with...within fine-grained overbank deposits, Filadelfia region, 2005. Hammer is 28 cm long. (e) Fine-grained deposits...bodies (Fig. 5f), which compositionally represent quartz arenites. The material described and illustrated |  | | Report (issue) | | ... 7 Gypsum quarries in the northern Faiyum quarry landscape, Egypt: a geo-archaeological case study...fingerprinting of Egyptian siliceous sandstones and the quarry source of the Colossi of Memnon Robert W.O’B. Knox...................... 77 Granite quarry survey in the Aswan region, Egypt: shedding new light on ancient...87 Preservation and promotion of the Sagalassos quarry and town landscape, Turkey Patrick Degryse, Ebru............................ 105 Constructing a quarry landscape from empirical data. General perspectives |  | Ainsworth, C.C., Zachara, J.M., Wagnon, K., McKinley, S., Liu, C., Smith, S.C., Schaef, H.T., Gassman, P.L. (2005) Impact of highly basic solutions on sorption of Cs+ to subsurface sediments from the Hanford site, USA. Geochimica et Cosmochimica Acta, 69 (20) 4787-4800 doi:10.1016/j.gca.2005.06.007 | Journal (article/letter/editorial) | | was observed to precipitate from suspensions of quartz (Bickmore et al., 2001), and chabazite and the...(XRD) and optical microscopy. For fractions ⬎2 m, quartz was dominant with lesser amounts of plagioclase...diameter shallow cavities in off-axis single-crystal quartz plates (Gem Dugout, State College, PA.). Mineral...precipitation; ii) solid precipitate identification; and iii) changes in CEC, which could have significant affects...after 112 days at the lowest base concentration. Fe(III)oxide formation resulted from biotite and chlorite |  | | Journal (article/letter/editorial) | | carbon contents (2.4–7.0 wt.%) of a mainly Type II + III kerogen have been deposited under dysoxic to anoxic...samples TOC (wt.%) Maturity (% VRr) Porosity (%) Quartz (%) Clay (%) Carb. (%) Pröttlin 1/1h/81 Eldena...lithofacies–mudstone diapir, well Zehdenick 2/75, 4932 m and quartz and chlorite filled fracture with small vug-like...carpets comprised of thin micro-conglomerates with quartz clasts (b4 mm) and reworked mud-flakes. Faults and...siltstones and sealed with dolomite, chlorite, quartz, and pyrite. Fracture fillings developed in lateral |  | | Journal (volume) | | he met with the source of these boulders in the region now known as the Uusikaupunki (Nystad) rapakivi...in boulderR . He adds, referring to a paper of Rössler, that the distanee of the sOllree may, in so me...been probable, had the . general geology of the region not been so thoroughly lmown as it was. Altogether...e boulders in all have b een found in the whole region. Two of them lay quite ne ar the chief ore of Otravaara...Jalonvaal'a was detected, Dr. Eskola found, in a region southeast of Lake Jänisjärvi, sevm'al glacial |  | | Journal (article/letter/editorial) | | intergrown or intercalated with macrocrystalline quartz, quartzine, opal-A, opal-CT, cristobalite and/or...characteristic agate banding and colors. Keywords: agate; quartz; chalcedony; silica minerals; micro-structure;...samples. Isotope and fluid inclusion studies on quartz and chalcedony samples were carried out to get...Switzerland. Separate chalcedony and macrocrystalline quartz pieces were prepared, chemically treated and analyzed...spectrometer [72]. Fluid inclusions in macrocrystalline quartz of the agates (polished 100 µm thick sections) |  | | Journal (article/letter/editorial) | | in colour and is very fine-grained and silty. The quartz grains in the sandstone show a gradual coarsening...Schneider, J.W., Ehling, B-C., Kleeberg, M. and Rössler, R., 2019. Late Palaeozoic red beds elucidate fluvial |  | | Book | | C. R. Robison ● D. M. Rohr ● E. J. Romero ● R. Rössler ● G. W. Rothwell ● N. P. Rowe ● A. C. Rozefelds...casts (FIG. 1.38) of the hollow pith or medullary region in calamites and preserve an impression of the...different mechanisms were involved, depending on the region and the location of the coal balls within the coal...(Chapter 3). In another study on fluid inclusions in quartz from the 3.5 Ga Dresser Formation (North Pole)...hyphae that are distinctly septate, with the central region of the septum slightly thickened (Kidston and Lang |  | | Journal (article/letter/editorial) | | analysis, decarbonated samples were CE inserted into quartz tubes with cupric oxide, evacuated on a vacuum...6396-6402. von Gunten, H.R., Sturm, M., Erten, H.N., Rössler, E., Wegmüller, F., 1987. Sedimentation rates in |
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