A structural study of the lithiophilite-sicklerite series

F. Hatert, L. Ottolini, J. Wouters, F. Fontan

Research output: Contribution to journalArticle

Abstract

A sample from the Koktokay No 3 granitic pegmatite, Altai Mountains, northwestern China, which shows a transition from lithiophilite [LiMn PO ] to sicklerite [Li Mn PO ], was investigated by single-crystal X-ray diffraction, electron-microprobe analysis, and secondary-ion mass spectrometry (SIMS) techniques. Under the polarizing microscope, the sample shows colorless lithiophilite and deep-orange sicklerite, as well as several intermediate phases. The chemical compositions change from Li (Mn Fe Fe )PO to Li (Mn Mn Fe ) PO , and show a progressive decrease of the lithium content from lithiophilite to sicklerite. Five crystals were extracted from the thin section, and their crystal structures were refined in space group Pbnm, with unit-cell parameters from a 4.736(1), b 10.432(2), c 6.088(1) Å (lithiophilite), to a 4.765(1), b 10.338(1), c 6.060(1) Å (sicklerite). The olivine-type structures of these phosphates are identical to that of triphylite, and are characterized by two chains of edge-sharing octahedra parallel to the c axis. The first chain consists of M1 octahedra containing Li atoms and vacancies, and the second chain consists of M2 octahedra occupied by Fe and Mn. The significant Mn content in sicklerite necessitates a more careful interpretation of the electron-microprobe data, and demonstrates the different mechanisms of oxidation affecting the lithiophilite-sicklerite and triphylite-ferrisicklerite series, respectively.
Original languageEnglish
Pages (from-to)843-854
Number of pages12
JournalCanadian Mineralogist
Volume50
Issue number4
DOIs
Publication statusPublished - 1 Aug 2012

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Electron probe microanalysis
Secondary ion mass spectrometry
Lithium
electron probe analysis
Vacancies
Microscopes
Crystal structure
Phosphates
Single crystals
crystal
X ray diffraction
Atoms
Oxidation
Crystals
Electrons
pegmatite
lithium
Chemical analysis
thin section
crystal structure

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Hatert, F. ; Ottolini, L. ; Wouters, J. ; Fontan, F. / A structural study of the lithiophilite-sicklerite series. In: Canadian Mineralogist. 2012 ; Vol. 50, No. 4. pp. 843-854.
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A structural study of the lithiophilite-sicklerite series. / Hatert, F.; Ottolini, L.; Wouters, J.; Fontan, F.

In: Canadian Mineralogist, Vol. 50, No. 4, 01.08.2012, p. 843-854.

Research output: Contribution to journalArticle

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