Crystal structure and composition of hiärneite and constitution of the calzirtite group

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
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Crystal structure and composition of hiärneite and constitution of the calzirtite group

Messaggio da Marco E. Ciriotti » mar 01 mar, 2022 11:50

Prossima pubblicazione.

Referenza:
▪ Holtstam, D. & Bindi. L. (2022): Crystal structure and composition of hiärneite, Ca2Zr4Mn3+SbTiO16, and constitution of the calzirtite group. Mineralogical Magazine, 86, (in press).

Abstract:
The crystal structure of hiärneite has been refined from single-crystal X-ray diffraction data (λ = 0.71073 Å) on type material from Långban, Värmland, Sweden. The refinement converged to R1 = 0.046 based on 1073 reflections with F2 > 4σ(F2). The tetragonal unit cell, space group I41/acd, has the parameters a = 15.2344(6) Å and c = 10.0891(6) Å with Z = 8. The mineral is isostructural with calzirtite, ideally Ca2Zr5Ti2O16, with a fluorite-derivated structural topology. In hiärneite, Mn3+ is ordered at a 4- to 8-fold coordinated site (with a distorted polyhedral coordination figure), without the atom splitting encountered at the corresponding Zr-dominated site of calzirtite. The end-member formula for hiärneite is established as Ca2Zr4Mn3+SbTiO16. The calzirtite group, with calzirtite, hiärneite and tazerhanite (cubic ZrO2-x), has been approved by IMA-CNMNC.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Crystal structure and composition of hiärneite and constitution of the calzirtite group

Messaggio da Marco E. Ciriotti » dom 22 mag, 2022 10:17

Pubblicazione effettuata.

Referenza:
▪ Holtstam, D. & Bindi. L. (2022): Crystal structure and composition of hiärneite, Ca2Zr4Mn3+SbTiO16, and constitution of the calzirtite group. Mineralogical Magazine, 86, 314-318.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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