Mineralogical and microstructural features of chalcedony from Mátra Mts, Northern Hungary – a tem study | Szegedi Tudományegyetem, Ásványtani, Geokémiai és Kőzettani Tanszék

Reference:
Acta Mineralogica-Petrographica, Szeged 2004, Vol. 45/1, pp. 101–106

Szerző:
Viktória Kovács Kis
István Dódony

Abstract:
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 Gyöngyössolymos, 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.

Letöltés

cta2004, microcrystalline silica, microstructure, moganite, quartz, SAED