 | Grew, E. S., Locock, A. J., Mills, S. J., Galuskina, I. O., Galuskin, E. V., Hålenius, U. (2013) Nomenclature of the garnet supergroup. American Mineralogist, 98 (4) 785-811 doi:10.2138/am.2013.4201 | Journal (article/letter/editorial) | | Mg3 Al2 Si3 O12 Grossular Ca3 Al2 Si3 O12 2+ Spessartine Mn 3 Al2 Si3 O12 2+ Almandine Fe 3 Al2 Si3...Grossular Ca3Al2(SiO4)3 {Ca3}[Al2](Si3)O12 2+ Spessartine (Mn )3Al2(SiO4)3 {Mn2+ 3 }[Al2](Si3)O12 2+ Almandine...evidence for a multisite OH substitution in spessartine-almandine garnets from Brazilian pegmatites,...arguments are not supported by a Si-deficient spessartine containing no Mn3+, but showing I41/acd symmetry...to constitute a distinct group because of their lower symmetry and because one tetrahedral site is largely |  | | Report (chapter) | | Nordbayern, Schlossgarten 5, 91054, Erlangen, Germany Chemostrat Ltd., 1 Ravenscroft Court, Buttington...at ~650-620 Ma and ~550 Ma (Kröner et al., 2003, Sommer et al., 2003, 2005). Moreover, zircon crystallisation...titanite assemblages reported (Lawley et al., 2014, Sommer and Kröner, 2013). The UUB formed in the Palaeoproterozoic...metamorphic rocks of ~953 Ma (Bingen et al., ED 2009, Sommer and Kröner, 2013). Based on the geological background...staurolite), (3) Zircon dominated (Upper Jurassic and Lower Cretaceous CC EP T samples, and (4) Epidote dominated |  | Jacob, J.-B., Martelat, J.-E., Goncalves, P., Giuliani, G., Devidal, J.-L., Feneyrol, J., Omito, E., Ichang'I, D. (2018) New P-T-X conditions for the formation of gem tsavorite garnet in the Voi area (southwestern Kenya) Lithos, 320. 250-264 doi:10.1016/j.lithos.2018.09.010 | Journal (article/letter/editorial) | | sapphire, emerald, different varieties of garnet (spessartine, tsavorite, hessonite), US tourmalines, spinel...Pare Mountain made of high grade rocks westward (Sommer et al., 2003, 2005; Möller et al., 2000; Tenczer...together with the ultramafic bodies, within the lower-grade metasediments. We selected a set of samples...The sample VOI-34, collected in the Ilani mining district (Fig.2), is formed by an assemblage of quartz...composition used in PerpleX. The grossular and spessartine contents of garnet predicted at these P-T conditions |  | Santos, Felipe Holanda dos, Amaral, Wagner da Silva, Konhauser, Kurt, Martins, Douglas Teixeira, Castro, Marco Paulo de, Queiroga, Glaucia Nascimento, Chi Fru, Ernest, Andersen, Morten B. (2021) Unraveling sedimentary precursors and metal enrichment of high-grade metamorphosed manganese-rich rocks from the Borborema Province, northeastern Brazil. Ore Geology Reviews, 137. 104283pp. doi:10.1016/j.oregeorev.2021.104283 | Journal (article/letter/editorial) | | manganese-oxyhydroxide and spessartine. The silicate manganese ore has rhodonite, tephroite and spessartine. Garnetite...Garnetite contains spessartine and minor quartz and rhodonite. The main host rocks include garnet quartzite and... The composition of carbonate inclusions in spessartine-rhodonite and Ca-Mn fractionation between garnet...and wackes) on the seafloor. The presence of spessartine, rhodonite, and tephroite suggests peak metamorphic...following manganese minerals: rhodo 2+ chrosite, spessartine (Mn3+ 2 Al2[SiO4]3), rhodonite-pyroxmangite (Mn |  | | Journal (article/letter/editorial) | | Al, Mg), andradite (Ca, Fe), jadeite (Na), spessartine (Mn), K-silicate glass (K), Basilicate glass...characterized by the highest XMg (up to 0.24) and spessartine content (~7 mol%) with comparatively low grossular...higher grossular content (6.5–10.5 mol%), but spessartine content is comparatively low (< 3.5 mol%). They...mol%, has comparatively lower XMg ratios (0.12 – 0.15) with low spessartine component similar to that...a.f.u.), and XMg (0.44–0.48) and significantly lower K (~ 0.30 a.f.u.) and Ti (~ 0.05 a.f.u.). Plagioclase |  | Tamblyn, R., Brown, D., Hand, M., Morrissey, L., Clark, C., Anczkiewicz, R. (2021) The 2 Ga eclogites of Central Tanzania: Directly linking age and metamorphism. Lithos, 380. 105890pp. doi:10.1016/j.lithos.2020.105890 | Journal (article/letter/editorial) | | magmas, which intruded between ca. 1940–1877 Ma (Sommer et al., 2005a). The calc-alkaline volcanics of...group also formed at this time (ca. 1920–1870 Ma; Sommer et al., 2005a; Bahame et al., 2016). An early...from metapelitic rocks of the Isimani Suite has a lower intercept age of 501 ± 26 Ma (Möller et al., 1995)...decreases from 0.57 in the core to 0.52 in the rim. Spessartine also decreases from 0.06 in the core to 0.02...µm of the garnet shows a slight increase in spessartine content (Fig. 3a), accompanied by a slight increase |  | | Journal (article/letter/editorial) | | Crystal _, structure of whitlockite frorn the Palerno quarry 120 CAMERON,KENNETHL. An experinental study of...uvarovite-spessartite 1l25 218,675,7122 Pyrope spessartine 79,4t8,LlzS uvarovite 418,1125 Geodes, feldspathic...Crystal structure of whitlockite fTorn the Palerrro quarry L20 lwai Gordon Research Conference, co-sponsored...modulated absorotion of Fe2-, Fe3*, and ltln2*'in spessartine and alrnandine garnets 79 Lunar minerals lunar...bauxite alteration Solongoite L62 new mineral (abstr) SOMMER,SHEFDON X-ray phetgelectron spectra of crs 1F4 |  | | Journal (issue) | | of this 35.56 ct gem, the former crown jewel of Bavaria and one of the largest historic blue diamonds ever...of color in a diamond. In the New York jewelry district on Maiden Lane, neighboring buildings were painted...effect; that is, the color will appear more yellow (a lower color grade). The relative amount of UV versus visible...GIA began in the early 1970s revealed that the lower UV content helped reduce the extreme appearance...observable (reported as “none”) fluorescence. For K and lower, a “faint” fluorescence reaction is acceptable. |  | | Journal (article/letter/editorial) | | - x x from the Ramihalt; rhodonite with good spessartine-xx from Pürsthütte on the Saualpe. From S a l...Kupferkies und Ankerit. Hier fand Dir. VAVROVSKY im Sommer 1980 Stücke mit 1 mm dicken, hellblaugrünen Krusten...Arlinggraben, Saualpe, Kärnten Die Fundstelle wurde im Sommer 1980 von J. BRANDTNER (Hattendorf) entdeckt, weitere...Kombination n( 101) mit u( 120), etwa wie Arsenkies von Franconia, N. H., auf. Die Bestimmung wurde durch Anschliff-...Neufund von Michael DIEWALD (Waidhofen/Ybbs) im Sommer 1980 im Bieberg-Steinbruch zeigte über bräunlichen |  | | Journal (article/letter/editorial) | | Bochum, Germany Rasterelektronenmikroskop, Ruhr-Universität Bochum, D-44780 Bochum, Germany 3Institute...g. Sr2+ are also able to suppress CL-intensity (Sommer, 1972). The dull luminescing garnet core (Fig....been observed without using the CL technique. Spessartine–pyrope–grossular garnet (characterized by low...cpx-matrix,upper part coarse-grained and rich in dol, lower part fine- and coarse grained cpx cpx, grt, Mg-cal...that the later garnet in the cracks is typically lower in Ca and Mn and higher in Fe and Mg (Gros52.1And5 |  | ENGVIK, A. K., TVETEN, E., BINGEN, B., VIOLA, G., ERAMBERT, M., FEITO, P., DE AZAVEDO, S. (2007) P-T-t evolution and textural evidence for decompression of Pan-African high-pressure granulites, Lurio Belt, north-eastern Mozambique. Journal of Metamorphic Geology, 25 (9) 935-952 doi:10.1111/j.1525-1314.2007.00736.x | Journal (article/letter/editorial) | | porphyroblasts are zoned with increasing almandine and spessartine contents and decreasing grossular and pyrope...decompression of the high-pressure granulites to lower pressure granulite facies conditions (stage II)...shows, in general, increasing almandine and spessartine contents and decreasing grossular and pyrope...composition of An30)44Ab55)68 Kfs2)3, and has a lower An-content relative to the plagioclase-inclusions...P–T determinations generally result in estimates lower than peak granulite facies conditions (Jiang & Lasaga |  | Chakrabarty, A., Mitchell, R. H., Ren, M., Saha, P. K., Pal, S., Pruseth, K. L., Sen, A. K. (2016) Magmatic, hydrothermal and subsolidus evolution of the agpaitic nepheline syenites of the Sushina Hill Complex, India: implications for the metamorphism of peralkaline syenites. Mineralogical Magazine, 80 (7) 1161-1193 doi:10.1180/minmag.2016.080.057 | Journal (article/letter/editorial) | | Considering the P/T range of the greenschist – lower-amphibolite facies of metamorphism it is evident...some reequilibration has taken place at relatively lower temperatures. The rare presence of antiperthite...or eudialyte. Sporadic occurrences of Mn-rich spessartine garnet were also noticed (Table 10) and have...INDIA TABLE 10. Representative compositions of spessartine. 1 2 SiO2 TiO2 Al2O3 FeO MnO MgO CaO 37.83...0.00 Ca 0.07 mol.% end-members Almandine 6.0 Spessartine 91.6 Pyrope 0.0 Grossular 2.5 Andradite 0.0 Uvarovite |  | | Book | | specimen, Bruce Cairncross photo; Title page: Spessartine garnet crystal embedded in muscovite schist matrix...(back right); blue sapphire corundum; orange spessartine garnets; green tourmaline; red garnet (pink ruby...artisanal miners in central Rwanda. In Rusizi District, Western Province, gem-quality pink and green...basaltic host rocks near Cyangugu, also in Rusizi District (Krezemnicki et al., 1996). Rwanda's mineral wealth... accessedjune 2018). Copper occurs in Mbarara District and the Karamoja Subregion, while copper and associated |  | | Book | | MineralogicalRecord.com I IIMORIITE-(Y) EUROPE FRANCE Trimouns quarry, Luzenac, Ariege. Operated for talc since the beginning...beginning of the 20th century, the Trimouns quarry became well known to collectors around 1990 for the...Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...1991). Simdeled, Aust-Agder. Early in 1999, in a quarry near S~ndeled, collectors opened a pocket containing...PORTUGAL Montijos quarry, Monte Redondo, Leiria Estremadura. The Montijos gabbro quarry at Monte Redondo |  | | Journal (article/letter/editorial) | | Am Roten Berg, Schneeberg–Neustädtel, Saxony, Germany. Occurrence: Found in the oxidation zone of the...nickellotharmeyerite, two new minerals from Schneeberg, Germany: description and crystal structure. Neues Jahrbuch...R.A., GUNTER, M.E., CAMPANA, C.F., RAKOVAN, J., SOMMER, A. & BRUESEKE, M.E. (2001): Dickthomssenite, Mg(V2O6)•7H2O...also from the Pucher Shaft, Schneeberg, Saxony, Germany. Occurrence: Associated minerals are: beudantite...Na4Zr2Si10O26•9H2O M ONOCLINIC Locality: Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada |  | Rusin, Anatolij, Molina, Jos� F., Poli, Stefano, Austrheim, H�kon, Glodny, Johannes (2004) Eclogite-facies vein systems in the Marun-Keu complex (Polar Urals, Russia): textural, chemical and thermal constraints for patterns of fluid flow in the lower crust. Contributions to Mineralogy and Petrology, 147 (4) 484-504 doi:10.1007/s00410-004-0569-z | Journal (article/letter/editorial) | | thermal constraints for patterns of fluid flow in the lower crust Received: 16 June 2003 / Accepted: 12 February...GeoForschungsZentrum Potsdam, Telegrafenberg C2, 14473 Potsdam, Germany A. Rusin Institute of Geology and Geochemistry...to drive mobile hydrofractures is significantly lower than that needed for fluid flow in a connected fracture...different perspective on metasomatic processes at lower crustal depths. In this complex, Austrheim (1998)...high-P event. In the northern part of the complex, lower temperature conditions are suggested by the presence |  | | Journal (article/letter/editorial) | | al. 1995; Vrána et al. 2004; Fritz et al. 2005; Sommer et al. 2005); the Mesoproterozoic–Neoproterozoic...2001; Sommer et al. 2003; Tenczer et al. 2006; Vogt et al. 2006; Hauzenberger et al. 2007; Sommer & Kröner...muscovite-bearing gneiss (Fig. 5a). Garnet is extremely spessartine-rich with a composition of Alm51 Prp8 Grs4 Sps37...Sillimanite-bearing metapelitic rocks generally reflect lower P-T conditions of 0.65 ± 0.11 GPa and 786 ± 137...8c). The pressure is further constrained to be lower than 1.45 GPa by the lack of rutile. This is in |  | | Journal (article/letter/editorial) | | the Institute of Geological and Nuclear Sciences, Lower Hutt, New Zealand. Oxygen isotopes where measured...there is a gradational change from relatively spessartine-rich, grossular-rich, and pyrope-poor core zones...zones out to rim zones that are relatively spessartine and grossular depleted, but pyrope-rich. The chemical...the vein and host rock garnets have similar spessartine zoning profiles, although the vein garnet has...respectively. These temperatures are roughly 60 °C lower than calculated peak temperatures, which is consistent |  | | Journal (article/letter/editorial) | | oligoclase-xx in the basalt zone of Klöch. From Lower A u s t r i a : the recently describes colourful...(54%) and grpssularite (31%), besides little spessartine (8%) and pyrope (6%). Auch im vergangenen Jahr...Schurfspitze bekannt. In einer Aufsammlung vom Sommer 1975, die H. PRASNIK (Landskron) ebendort im erzführenden...H i n t e r w ö l c h , Kärnten Einen schon im Sommer 1971 getätigten Fund von Dr. P. BECKMANNAGETTA...(Ried/Innkr.) und Dir. V. VAVROVSKY (Althofen) im Sommer 1976 im Steinbruch bei der Bahnstation von Allerding |  | | Journal (article/letter/editorial) | | Ca-poor Fe–Mn–Al chemical series almandine–spessartine-pyrope versus Ca-rich Fe–Al chemical series ...3) [57]. magnesite), garnets (almandine and spessartine) and feldspars (albite and microcline). Pyroxenes...(dolomite and magnesite), garnets (almandine and spessartine) and feldspars (albite and microcline). also...“unmixed” proportion of almandine (blue) and spessartine (orange) garnets as well as garnets the processed...“unmixed” proportion of almandine (blue) and spessartine (orange) wavelength position of the garnet reflectance |  | | Journal (article/letter/editorial) | | in the thin section equilibrated with garnet. At lower temperatures local zoning developed, but did not...Africa (Appel et al., 1998; Möller et al., 2000; Sommer et al., 2003; Hauzenberger et al., accepted). This...pattern of almandine, pyrope, grossular and spessartine along lines depicted in Fig. 2. Profiles were...temperatures around ~ 730°C, which is significantly lower than estimated peak PT from mafic granulites. Garnet...well as biotite inclusions in garnet give even lower temperatures of around 530-600°C. In summary, garnet |  | | Journal (issue) | | vivid “canary” yellow elbaite from the Lundazi District of eastern Zambia, the most important source of..._____________________ 358 Lab Notes Apatite in spessartine • Atypical photoluminescence feature in a type...Furuya, the founder and director of the Japan Germany Gemmological Laboratory in Kofu, Japan, had recently...the Japanese market. He established the Japan Germany Gemmological Laboratory in 1994 and had served...Rena. His son will continue the work of the Japan Germany Gemmological Laboratory. GEMS & GEMOLOGY WINTER |  | | Book | | Economic Geology from the University of Hamburg (Germany), where he also served as a Visiting Professor...degrees of interaction between mantle-derived magmas, lower crustal felsic magmas, and, most likely, both mantle-...(kyanite, green andalusite, garnet -grossular, and spessartine- and red-epidote) of “near” gem-quality from...transparent varieties of spodumene (kunzite), low-iron spessartine, and optical-grade quartz [1]. The Boqueirão...and Liquids; Weber, A., Ed.; Springer: Berlin, Germany, 1979; pp. 123–166. Wopenka, B.; Pasteris, J.D |  | | Book | | VII VII Vulkangesteine am Ätna, Dr. Landmann, Sommer 2012 Inhalt Vorwort�����������������������...dunkelroten Granateinschlüssen, Meraner Höhenweg, Sommer 2012, Bildbreite 30 cm. Foto: Dr. Landmann 2.2 Metamorphite...bei einem Vulkanausbruch. Stromboli, Süditalien, Sommer 2012. Foto: Dr. Landmann Abb. 2.9 Lavagesteine...und die Geschichte von der versteinerten „4“ Im Sommer 2007, bei schönstem Sonnenschein mitten im Lahntal...Abenteuer Mineralogie Bims und der Hauyn Es war im Sommer 2005. Mit unserer Exkursionsgruppe waren wir in |  | | Report (issue) | | MIGUEL CALVO 43 48 France BY CHRISTOPHE LUCAS Lower Left: Completely immersed in his work, Brian Stefanec...The fluid inclusions in Illinois fluorite shown lower right each contain brine, a methane gas bubble,... Iridescent Fluorite from Ohio's Findlay Arch District BY JASON MCDONALD 69 Canada BY MARK MAUTHNER...times. Splendid green, pink, and violet hues, Germany and the Czech Republic. The mountains not to mention...Pakistan Dudley Blauwet specimen; Kevin Dixon photo Lower right: Spinet-law penetration twin; 3. 6 cm wide; |
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Sommer quarry, Wendelberg, Haibach, Aschaffenburg District, Lower Franconia, Bavaria, Germany