prvi kongres hrvatskih znanstvenika iz domovine i inozemstva - HATZ

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PRVI KONGRES HRVATSKIH ZNANSTVENIKA IZ DOMOVINE I INOZEMSTVAZagreb - Vukovar, 15. - 19. studenog 2004.P - 8NANOCRYSTALS OF TRIDYMITE IN OPAL CAVITIESBermanec, V.; Tomašić, N.; Karfunkel, J.; Scholz, R.; Kniewald, G.; Jaksch, H.Faculty of Science, University of Zagreb, CroatiaTwo opal samples were investigated by X-ray diffraction and FESEM. Green opal fromGoleš ultramafic rocks was designated as opal–CT. Reddish opal from the Spančevski ridsedimentary sequence was also determined as opal-CT, although it could be consideredas a boundary case with opal-C. Both opals contain other mineral phases like sepiolite orkaolinite and hematite. FESEM images showed on both opal samples the presence ofcavities filled with spheres. The spheres are covered with hexagonally shaped crystalspresumably being tridymite. Common morphological properties of the low and hightemperature forms of tridymite cannot unambiguously confirm the high temperaturehydrothermal stage in the formation of the investigated opal-tridymite association.Presented on:2004 ICAM-BR, Aguas de Lidndoia, Applied Mineralogy,Sao Paolo, Brasil, 19.- 22. 09.2004Principal Investigator : Dr.sc. Vladimir BermanecProject No. 011942010
PRVI KONGRES HRVATSKIH ZNANSTVENIKA IZ DOMOVINE I INOZEMSTVAZagreb - Vukovar, 15. - 19. studenog 2004.P - 9UNUSUAL ANATASE CRYSTAL FROM THE DIAMANTINA REGION(Mintas Gerais, Brasil)Bermanec, V.; Karfunkel, J.; Zebec, V.; Scholz, R.; Menezes, L.; Chaves, M.N.S.C.;Tomašić, N.Faculty of Science, University of Zagreb, CroatiaUnusual doubly terminated anatase crystals were found in aluvial deposits nearDiamantina, Minas Gerais, Brazil. They are colourless to ochre brown and black in colourwith frequently octahedral habit resembling to diamonds. The crystals are usually smallwith the largest individuals not exceeding 2 cm. They are rarely rounded indicating shorttransport. Two types of anatase crystals were investigated. One type has simple crystalhabit only with faces of {;011};present. Another type occurs in a form of complexdipyramidal crystals in parallel growth resembling to small swards. The central crystal isthe biggest one and every further crystal is smaller. This formation ends up with {;013};and {;017}; form. It frequently happens for the smaller crystals to obey parallel growthboth on the top and the bottom of the central crystal. Sometimes they are arranged at thecorners of the central crystal like satellites containing pinacoid beside dipyramids. Also,these complex formations can vary in respect to the s<strong>iz</strong>e of the smaller crystal, but alsocan contain additional forms, for instance {;112};. X-ray diffraction experiments onpowdered samples confirm the presence of anatase and rutile. The calculated unit cellparameters for anatase are a=3.773(2) Å ; , c=9.475(9) Å ; and V=134.9(2) Å ; 3,suggesting no important substitutions in its crystal structure. Along rutile, two types ofmica, zircon, monazite-(Ce) and Mg-Fe carbonate were identified using SEM equippedwith EDS. The relationship between anatase and rutile seems to be complex since rutilewas found in a form of needle-like inclusions in anatase, but also some completepsudomorphs of rutile after anatase with preserved anatase morphology were collected.These different types of anatase-rutile occurrence impart contradictory interpretations oftheir formation, as rutile included in anatase can be considered to have formed first, butthe one found as a pseudomorph on anatase obviously grew later.Presented on:32nd International Geological Congress,Firenze, Italy, 20 - 28 August 2004Principal Investigator : Dr.sc. Vladimir BermanecProject No. 011942011
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prvi kongres hrvatskih znanstvenika iz domovine i inozemstva - HATZ

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