Cronstedtite polytypes in the Paris meteorite - Université de Lorraine Access content directly
Journal Articles European Journal of Mineralogy Year : 2018

Cronstedtite polytypes in the Paris meteorite

Abstract

The first detailed crystallo-chemical and crystallographic description of cronstedtite with extraterrestrial origin has been presented in this study. The analysed crystals have been found in the Paris meteorite, which is the least altered carbonaceous chondrite currently known, and they result from the pseudomorphism of anhydrous silicates. 3D electron diffraction collected by combining electron diffraction tomography (EDT) and precession electron diffraction (PED) are used to identify the cronstedtite polytypes, because of their small size. All identified polytypes are MDO, and the most abundant one is 1T. Many other crystals also belong to the subfamily C, but their stacking disorder hampers the polytype identification. Only in a crystal, the 3T and 2M 1 polytypes are recognised. TEM-2 EDX data indicate that the chemical composition of the crystals is similar, regardless their polytypic sequence.
Fichier principal
Vignette du fichier
Pignatelli-final.pdf (678.84 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-02357538 , version 1 (10-11-2019)

Identifiers

Cite

Isabella Pignatelli, Enrico Mugnaioli, Yves Marrocchi. Cronstedtite polytypes in the Paris meteorite. European Journal of Mineralogy, 2018, 30 (2), pp.349-354. ⟨10.1127/ejm/2018/0030-2713⟩. ⟨hal-02357538⟩
18 View
184 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More