 | | Report (issue) | | The Natural History Museum of Milan and its Madagascar Collection The Museo Civico di Storia Naturale... the museum began paleontologic fieldwork in Madagascar (upper Permian fauna and Jurassic and Cretaceous...fieldwork in Madagascar in 1996 in collaboration with other institu tions in Madagascar, Italy, and the...Pezzotta has spent a total of twenty nine months in Madagascar making geological-mineralogical surveys. In collaboration...both classic and new minerals and gemstones from Madagascar opened at the Natural History Museum in Milan |  | | Journal (article/letter/editorial) | | granitic pegmatites of the Itremo region, central Madagascar Federico Pezzotta In the last decade, in pegmatite...metasedimentary upper unit of the Itremo Group, Central Madagascar (Fernandez et aI., 2001), local mining cooperatives...interest for Ta-Nb borates: 1) central Sahatany valley, south of Antsirabe (pegmatites of Manjaka, 1I0ntsa and...and Marirana); 2) Manandona valley, south of the Sahatany (pegmatite of Antandrokomby); 3) Manapa-Antsetsindrano...associated with elongated crystals of danburite, K-feldspar, green to pink spodumene, with minor quartz. |  | Novák, Milan, Cempírek, Jan, Gadas, Petr, Škoda, Radek, Vašinová Galiová, Michaela, Pezzotta, Federico, Groat, Lee A. (2015) Boralsilite and Li, Be-bearing "Boron Mullite" Al8B2Si2O19, Breakdown products of spodumene from the Manjaka pegmatite, Sahatany valley, Madagascar. The Canadian Mineralogist, 53 (2) 357-374 doi:10.3749/canmin.1400092 | Journal (article/letter/editorial) | | SPODUMENE FROM THE MANJAKA PEGMATITE, SAHATANY VALLEY, MADAGASCAR MILAN NOVÁK§ Department of Geological...elbaite-subtype Manjaka granitic pegmatite, Sahatany Valley, Madagascar. The pegmatite mineral assemblage is...long, mostly as narrow albite > K-feldspar zones (albite > K-feldspar > boralsilite > “boron mullite”)... are mostly enclosed in albite and rarely in K-feldspar. The EMP and LA-ICP-MS data yielded relatively...solidus/early subsolidus, granitic pegmatite, Manjaka, Madagascar. INTRODUCTION Boralsilite, Al16B6Si2O37, a rare |  | | Journal (article/letter/editorial) | | (at Tamponilapa and Tsarafara-Nord, Sahatany Valley, Madagascar) and paragneisses (at Ctidružice, Moldanubian...Novák Tamponilapa and Tsarafara-Nord, Sahatany Valley, Madagascar and Ctidružice, Moldanubian Zone, Czech...Pegmatite fields of Central Madagascar The pegmatites of the Sahatany Valley pegmatite field are located...north-eastern part of the Itremo Region, Central Madagascar built by low- to medium-grade metamorphic rocks...dominance of elbaite-subtype pegmatites in this district (see Ranorosoa 1986; Novák et al. 2015a). Mineral |  | Cempírek, Jan, Grew, Edward S., Kampf, Anthony R., Ma, Chi, Novák, Milan, Gadas, Petr, Škoda, Radek, Vašinová-Galiová, Michaela, Pezzotta, Federico, Groat, Lee A., Krivovichev, Sergey V. (2016) Vránaite, ideally Al16B4Si4O38, a new mineral related to boralsilite, Al16B6Si2O37, from the Manjaka pegmatite, Sahatany Valley, Madagascar. American Mineralogist, 101 (9) 2108-2117 doi:10.2138/am-2016-5686 | Journal (article/letter/editorial) | | Al16B6Si2O37, from the Manjaka pegmatite, Sahatany Valley, Madagascar Jan Cempírek1, Edward S. Grew2,*, Anthony...anhydrous ternary BAS phase, is found with albite and K-feldspar as a breakdown product of spodumene in the elbaite-subtype...elbaite-subtype Manjaka granitic pegmatite, Sahatany Valley, Madagascar. Boralsilite also occurs in this association...products of a residual liquid rich in Li, Be, Na, K, and B during a pressure and chemical quench, but...diffusion rates. Keywords: Vránaite, boralsilite, Madagascar, pegmatite, new mineral, structural complexity |  | Zagorsky, Victor Y., Peretyazhko, Igor S., Sapozhnikov, Anatoliy N., Zhukhlistov, Anatoliy P., Zvyagin, Boris B. (2003) Borocookeite, a new member of the chlorite group from the Malkhan gem tourmaline deposit, Central Transbaikalia, Russia. American Mineralogist, 88 (5) 830-836 doi:10.2138/am-2003-5-611 | Journal (article/letter/editorial) | | veins, Malkhan gem tourmaline deposit, Chikoy district, Chita oblast, Russia. Borocookeite proper, as...temperatures not less 265–240 rC. The ratio of activities of K, Li, B, F, and H2O in the mineral-forming fluids of...belonging to the chlorite group) in pegmatites in Madagascar (Lacroix 1912, 1922). Boron-containing cookeites...gem tourmaline-bearing pegmatite bodies in the district. However, true borocookeite occurs only in the...pegmatitic K-feldspar alternating with blocky Kfeldspar and, in places, quartz. The K-feldspar is often |  | | Report (issue) | | in an LCT-type pegmatite. Association: Quartz, K-feldspar, plagioclase, elbaite, schorl. Tsilaisite, fluortsilaisite...Name: For the Tsilaisina mine in the Sahatany Valley, Madagascar, from where the first Mn-rich tourmalines |  | Pekov, I. V., Yakubovich, O. V., Massa, W., Chukanov, N. V., Kononkova, N. N., Agakhanov, A. A., Karpenko, V. Y. (2010) Londonite from the Urals, and new aspects of the crystal chemistry of the rhodozite-londonite series. The Canadian Mineralogist, 48 (2) 241-254 doi:10.3749/canmin.48.2.241 | Journal (article/letter/editorial) | | Central Urals, Russia. All are Cs-dominant (Cs > K) and must now be considered londonite. The crystal...solved from single-crystal data collected at 193 K and refined to R = 0.0203. The mineral is cubic, space... Both Cs+ and K+ are ordered in the cages of the quasi-framework. The very short Cs–K distance, 0.51(3)...occupancy of these positions in the same cage. The Be and K atoms are also separated by an unallowable short distance...system between rhodizite (K-dominant), londonite (Cs-dominant) and the hypothetical K- and Cs-free analogue |  | | Journal (article/letter/editorial) | | new subtype of the rare-element class M . N o v f i k 1 a n d P. P o v o n d r a 2 i Department of Geological...through a graphic unit to local pods of blocky K-feldspar. Patches of an albitic unit are associated with...schriftgranitischen Zone mit Nestern mit blockigem K-Feldspar. Albit-reiche Zonen die sich im zentralen Teil...Ctidru~ice, Biskupice, Vlast~jovice, Kom/trovice, Jeclov II). However, isolated occurrences also are present...plagioclase + K-feldspar + biotite) which grade inwards, through a locally dominant graphic unit (K-feldspar + quartz) |  | | Report (issue) | | of a liddicoatite crystal from Anjanabonoina, Madagascar. Photo by Bild & Text Mager Dedicated to Dr...University. All rights re served. Photo by William K. Sacco 4 By 1717 gem tourmaline was being referred...University. All rights reserved. Photography by William K. Sacco 5 For about fifty years, tourma line was...at as a possible gemstone, and German scientists K. Schmelzer and J. Ottemann published a paper ( 1 979)...site in the structural formula are: X= Na+, Ca2+, K+, Y = Li+, Mg2+, Fe2+, Mn2+, A13+, Fe3+, Cr3+, y3+ |  | | Journal (article/letter/editorial) | | constituents of the aplite are albite, potash-feldspar, lithian-micas, and quartz in varying amounts...orthoclase, and colourless lithian mica. 444 O. VON K N O R R I N G AND E. C O N D L I F F E (b) 'White...granite pegmatites where the principle potassium feldspar is commonly microcline. Of a large number of African...rubellite-kunzite-rhodizite pegmatite in the Sahatany Valley of Madagascar. The K-feldspar in the narrow, axinite-bearing...distinguish, with the naked eye, from the ubiquitous feldspar which they resemble. Amblygonite, like N B - |  | | Journal (article/letter/editorial) | | P.~ERN~, P.POVONDRA & J.STANI~K ~:ern~r, P., Povondra, P. & Stan~k, J. 1971: Two cockeites from Czechoslovak;a:...Mineralogie, Ruhr-Universit&'t, Bgchum. ~. ,~tan~k, Katedra ~,zineralogie e petrografie, Univ. ~. E....Voda examined earlier by Sekanina (1946) and Stan~k (1965), differs from other cookeites in the intensi+...biotite 8 P. {~ERNY, P. POVONDI~t. & J. STAN]~K k \. Fig. 1. Cookeite (high r~::~ef, upper part)...cookeite imbedded in granular adularia-tiCpe K-feldspar; grain size of the feldsl:ar is not shown because |  | Novák, M., Prokop, J., Losos, Z., Macek, I. (2017) Tourmaline, an indicator of external Mg-contamination of granitic pegmatites from host serpentinite; examples from the Moldanubian Zone, Czech Republic. Mineralogy and Petrology, 111 (4) 625-641 doi:10.1007/s00710-017-0512-4 | Journal (article/letter/editorial) | | rocks (group A) of anatectic or metasomatic origin, (ii) subhomogeneous to simply zoned barren pegmatite...of pegmatite solidification (Novák et al. 2012); (ii) post-emplacement stage of contamination of pegmatite...structure in various pressuretemperature conditions, (ii) common occurrence in different stages of pegmatite...orthogneiss, quartzite, amphibolite is overlain by (ii) the Varied group, Tourmaline, an indicator of...2015b): (i) pre-Variscan (metamorphosed) pegmatites; (ii) several types of simple anatectic (abyssal) pegmatites; |  | | Journal (article/letter/editorial) | | to cultural timescales M. EBERT1*, K. KANDLER1, C. DEUTSCHER, K. LIEKE1, D. MÜLLER-EBERT1, L. SCHÜTZ2...Germany The Saharan Mineral Dust Experiment II (SAMUM II) is dedicated to the understanding of the radiative...burning events. Iron isotope fractionation during Fe(II) oxidation and precipitation of iron in acid mine...isotope fractionation during the oxidation of Fe(II)aq into Fe(III)aq by A. ferrooxidans was controlled...focused on iron isotope fractionation during the Fe(II) oxidation and the subsequent precipitation of iron |  | Bosi, F., Skogby, H., Agrosi, G., Scandale, E. (2012) Tsilaisite, NaMn3Al6(Si6O18)(BO3)3(OH)3OH, a new mineral species of the tourmaline supergroup from Grotta d'Oggi, San Pietro in Campo, island of Elba, Italy. American Mineralogist, 97 (5) 989-994 doi:10.2138/am.2012.4019 | Journal (article/letter/editorial) | | island of Elba, Italy, in association with quartz, K-feldspar, plagioclase, elbaite, and schorl. Crystals are...XY3Z6T6O18(BO3)3V3W, where [9]X = Na, Ca, (=vacancy), K; [6] Y = Al, Fe3+, Cr3+, V3+, Mg, Fe2+, Mn2+, Li,...derived from the Tsilaisina mine in the Sahatany Valley (Madagascar) where the first Mn-rich tourmalines...Jadeite Na 0.67(2) K2O 0.03 0.02–0.04 0.01 Orthoclase K 0.007(2) Li2O 0.81 0.76–0.85 0.10 Elbaite Li 0.54(7)...minéraux des pegmatites des environs d’Antsirabe à Madagascar. Mémoires de la Société de physique et d’Histoire |  | | Journal (article/letter/editorial) | | hydrothermal beryl II and phenakite II occur in miarolitic pockets (paragenetic type II). Secondary hydrothermal...elevated contents of Na, Cs, Mg, Fe, Sc in beryl I and II; Na, Ca, Mg, Fe, Al in bazzite III; REE in milar...magmatic Be-minerals within a single pegmatite district is exceptional and it is constrained by variable...7 ppm), Cr (270–650 ppm), Cs (20–40 ppm), a high K/Rb (133–171), but low CaO (2.3–4.8 wt. %) and Sr contents...Kožichovice I,II; POZ – Pozďátky; KLU – Klučov III; OKR – Okrašovice; CIM – Číměř I,II; KRA – Kracovice |  | Čopjaková, Renata, Prokop, Jiří, Novák, Milan, Losos, Zdeněk, Gadas, Petr, Škoda, Radek, Holá, Markéta (2021) Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites: Multistage processes with distinct fluid sources. Lithos, 380. 105823pp. doi:10.1016/j.lithos.2020.105823 | Journal (article/letter/editorial) | | compositional/paragenetic types are defined: Ca,Mg-, Na,K,Mg-, K,Mg- and K,Nadominant. Sources of fluids include (i)...pegmatite melt (Na, K, Ca, ± Li), particularly in the more evolved pegmatites, and (ii) fluids infiltrated/diffused...quartz and tourmaline of as well as common late K-feldspar, zeolites, arfvedsonite, and minor smectite suggests...Oslavany II) and more evolved, complexly zoned pegmatite dikes with Be -p minerals (Věžná II, Věžná I);...calc-silicate rocks. Both ro groups are overlain by (ii) the structurally highest Gföhl Unit comprising felsic |  | | Journal (issue) | | to Pinkish Orange Malaya Garnets from Bekily, Madagascar Karl Schmetzer, Thomas Hainschwang, Lore Kiefert...Heinz-Jürgen Bernhardt Malaya garnets from southern Madagascar, only the second commercial source of this material...the Anahí mine, Bolivia • “Copal” resin from Madagascar • Iolite and corundum from Wyoming • Green kyanite...publisher. ABOUT THE COVER The Ramona pegmatite district in southern California was the world’s leading...The well-respected names on our masthead are only a K. Myers S. Overlin partial list of the many experts |  | | Journal (issue) | | Rhodizite-Londonite from the Antsongombato Pegmatite, Central Madagascar Brendan M. Laurs, Federico Pezzotta, William...Process ratified • Alexandrite from Mananjary, Madagascar • Colorchange apatite from Kazakhstan • New emerald... Spring 1987 issue of Ornament magazine (see R. K. Liu, “Material in ancient and ethnic jewelry from...right is a hornbill “ivory” ojime. Photos by Robert K. Liu; courtesy of and © 1977 Ornament magazine. IN...68); and Steve Ulatowski of New Era Gems, Grass Valley, California, for the before-and-after sample of |  | | Book | | -~~1---------- 1960-2015 by Thom.as P. Moore Volume II I-Z Published by the Mineralogical Record, Inc....Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...massive calcite. or, rarely, still attached to the feldspar/mica walls of the dike (www.davidkjoyceminerals...crystals of rutile (Weerth, 2004). Tonniq Valley, Skardu district, Gilgit-Baltistan [Northern Areas]. Beginning...region of Alpine-type clefts along the Torrniq Valley produced small numbers of ilmenite specimens reminiscent |  | | Journal (issue) | | gressman@minrec.org Articles The Malkhan Pegmatite District Krasny Chikoy, Transbaikalia, Eastern Siberian...the Forgotten Pocket, Sosedka pegmatite, Malkhan district. The same specimen as shown from a different angle...Graeme Irv Brown Martin Zinn 234 FELLOWS Bryan K. Lees (2008–2018) Paul Harter (2009–2018) Dan Weinrich...Carter (2012–2019) Wally Mann (2012–2018) George K. Hickox, Jr. (2012–2018) David E. Ellis (2012–2018)...cell.: +43 (0)664 4047940 The Malkhan Pegmatite District Krasny Chikoy, Transbaikalia, Eastern Siberian |  | | Journal (issue) | | Museum Toronto, Ontario Steven R. Morehead Green Valley, AZ Donald R. Peacor University of Michigan Ann...modified from Price and Douglas (1972) and Peck and Valley (2000). staff in 1983. Over the next decade, approximately...complex (Currie, 1976), the St. Veronique and Lac Rouge K-rich to shoshonitic plutons (Corriveau, 1984, The...chabazite ➞ thomsonite ➞ mesolite ➞ analcime ➞ calcite(II) ➞ illite. At locality 44, pseudomorphs of albite...in the world for the mineral. Chabazite-Ca (Ca0.5,K,Na)4[Al4Si8O24]⭈12H2O Chabazite-Ca is clearly the |  | | Report (issue) | | done world tenowned work on the pegmatit.es of Madagascar and bu beln msttumental. in the discovery of...stored in his house in San Piero. During World War II, Adam served in the Dutch Army directing Far East...hotel is located in the heart of the pegmatite district in the village of Cavoli, which boasts a wonderful...quartz, potassium feldspar, plagioclase, biotite, muscovite, and tourmaline. Complex II extends along the...outcrop along the separation line between Complex II and Complex III. Complex IV includes most of central-eastern |  | | Journal (issue) | | discuss the requirements. FELLOWS FELLOWS Bryan K. Lees (2008–2016) Richard A. Olsen (2013–2016) Stephen...Mike Fleeman (2016) SPONSORING ORGANIZATIONS George K. Hickox, Jr. (2012–2016) David and Marcie Bristol...FineMineral.com APATITE Nagar, Hunza Valley, Gilgit District, Northern Areas, Pakistan, 11.5cm. Fine...Thomas P. Moore3 Wendell E. Wilson4 The N’Chwaning I, II and III mines in the Kalahari Manganese Field have...specimens of manganite, calcite, hydroxyapophyllite-(K) 1 Geology Department, University of Johannesburg |  | | Book | | OROGENIC AND POST-OROGENIC PLUTONISM IN Marawi 119 K. Bloomfield MINERALOGICAL AND GEOCHEMICAL ASPECTS...BEARING ON THE POSTULATED FRAGMENTATION OF GONDWANALAND K.-G. Cox 11 211 PETROCHEMICAL AND TECTONIC RELATIONSHIP...Rue Kessler, Clermont-Ferrand, France. BLOOMHELD, K., Geological Survey and Mines Department, P.O. Box...Sciences, University of Leeds, Leeds, U.K. Cox, K. G., Grant Institute of Geology, Kings Buildings,...and daring pioneer expedition to the great Rift Valley of East Africa in 1892-3. The expedition which |
|
Marirana Pegmatites, Marirana, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar