Authors:	Götz, Emilia Kleebe, Hans-Joachim Kolb, Ute
Title:	The hierarchical internal structure of labradorite
Online publication date:	13-Apr-2023
Year of first publication:	2022
Language:	english
Abstract:	The different structural features of labradorite and its incommensurate atomic structure have long been in the eye of science. In this transmission electron microscopy (TEM) study, all of the structural properties of labradorite could be investigated on a single crystal with an anorthite–albite–orthoclase composition of An53:4Ab41:5Or5:1. The various properties of labradorite could thus be visualized and connected to form a hierarchical structure. Both albite and pericline twins occur in the labradorite. The size of alternating Ca-rich and Ca-poor lamellae could be measured and linked to the composition and the color of labradorescence. Furthermore, a modulation vector of 0.0580(15)a C0.0453(33)b 􀀀0.1888(28)c with a period of 3.23 nm was determined. The results indicate an e labradorite structure, which was achieved by forming Ca-rich and Capoor lamellae. The average structure and subsequently the incommensurate crystal structure were solved with a three-dimensional electron diffraction (3DED) data set acquired with automated diffraction tomography (ADT) from a single lamella. The results are in good agreement with the structure solved by X-ray diffraction and demonstrate that 3DED–ADT is suitable for solving even incommensurate structures.
DDC:	540 Chemie 540 Chemistry and allied sciences 550 Geowissenschaften 550 Earth sciences
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 09 Chemie, Pharmazie u. Geowissensch.
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-8846
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	European Journal of Mineralogy 34 5
Pages or article number:	393 410
Publisher:	Copernicus Publications
Publisher place:	Göttingen
Issue date:	2022
ISSN:	1617-4011
Publisher DOI:	10.5194/ejm-34-393-2022
Appears in collections:	DFG-491381577-G