Abstract.
Representative samples of the two fabric varieties of microcrystalline quartz, chalcedony and quartzine, from agates of different origin were investigated by transmission electron microscopy (TEM). Both varieties contain lamellar admixtures of the SiO2 mineral moganite. The transitions from quartz to moganite within the fabric differ in a characteristic way. Whereas in quartzine the gradient between the structures is steep, the transition is more continuous in chalcedony. The morphology of moganite in chalcedony and quartzine is determined by the (101)-face; in pure moganite from Gran Canaria it is governed by the (110)-face.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Electronic Publication
Rights and permissions
About this article
Cite this article
Wahl, .C., Miehe, .G. & Fuess, .H. TEM characterisation and interpretation of fabric and structural degree of order in microcrystalline SiO2 phases. Contrib Mineral Petrol 143, 360–365 (2002). https://doi.org/10.1007/s00410-002-0348-7
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s00410-002-0348-7