Mineralogical and microstructural features of chalcedony from Mátra Mts, Northern Hungary - a tem study

The association and structural relationships of moganite, a recently described silica polymorph, and microcrystalline silica were studied using petrographic microscopy. X-ray powder diffraction, and scanning and transmission electron microscopy. We studied a chalcedony sample, a common fibrous micro...

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Bibliographic Details
Main Authors: Kovács Kis Viktória
Dódony István
Format: Article
Published: Department of Mineralogy, Geochemistry and Petrology, University of Szeged Szeged 2004
Series:Acta mineralogica-petrographica 45 No. 1
Kulcsszavak:Földtan, Ásványtan, Kőzettan
Subjects:
Online Access:http://acta.bibl.u-szeged.hu/25120
Description
Summary:The association and structural relationships of moganite, a recently described silica polymorph, and microcrystalline silica were studied using petrographic microscopy. X-ray powder diffraction, and scanning and transmission electron microscopy. We studied a chalcedony sample, a common fibrous microcrystalline silica variety from Gyongyossolymos, northern Hungary. Morphological and optical characteristics such as fiber striations and wrinkle banding and the association of mineral phases (quartz, moganite and cristobalite) are reported. Selected-area electron diffraction patterns of twinned domains with periodic and non-periodic twin planes are discussed in relation to moganite and quartz structures.
Physical Description:101-106
ISSN:0365-8066