Vapnikite Ca<SUB>3</SUB>UO<SUB>6</SUB> – a new double-perovskite mineral from pyrometamorphic larnite rocks of the Jabel Harmun, Palestinian Autonomy, Israel

Galuskin, E. V.; Galuskina, I. O.; Kusz, J.; Armbruster, Thomas Michael; Marzec, K. M.; Dzierżanowski, P. (2014). Vapnikite Ca<SUB>3</SUB>UO<SUB>6</SUB> – a new double-perovskite mineral from pyrometamorphic larnite rocks of the Jabel Harmun, Palestinian Autonomy, Israel. Mineralogical magazine, 78(3), pp. 571-581. Mineralogical Society 10.1180/minmag.2014.078.3.07

[img] Text
s7.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (1MB) | Request a copy

The new mineral species vapnikite, Ca3UO6, was found in larnite pyrometamorphic rocks of the Hatrurim Formation at Jabel Harmun in the Judean desert, Palestinian Autonomy, Israel. Vapnikite is an analogue of the synthetic ordered double-perovskite β-Ca3UO6 and is isostructural with the natural fluorperovskite – cryolite Na3AlF6. Vapnikite Ca3UO6 (P21/n,Z = 2, a = 5.739(1), b = 5.951(1), c = 8.312(1) Å, β = 90.4(1)°, V = 283.9(1) Å3) forms yellow-brown xenomorphic grains with a strong vitreous lustre. Small grains up to 20 – 30 m m in size are wedged between larnite, brownmillerite and ye'elimite. Vapnikite has irregular fracture, cleavage and parting were not observed. The calculated density is 5.322 g cm–3, the microhardness is VHN25 = 534 kg mm–2 (mean of seven measurements) corresponding to the hardness of ~5 on the Mohs scale. The crystal structure of vapnikite Ca3UO6 differs from that of its synthetic analogue β-Ca3UO6 by having a larger degree of Ca, U disorder. Vapnikite formed at the high-temperature retrograde stage of pyrometamorphism when larnite rocks were altered by fluids/melts of high alkalinity.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences > Mineralogical Crystallography (discontinued)
08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Armbruster, Thomas Michael

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0026-461X

Publisher:

Mineralogical Society

Language:

English

Submitter:

Sarah Antenen

Date Deposited:

10 Aug 2015 10:55

Last Modified:

22 Dec 2015 16:18

Publisher DOI:

10.1180/minmag.2014.078.3.07

BORIS DOI:

10.7892/boris.70757

URI:

https://boris.unibe.ch/id/eprint/70757

Actions (login required)

Edit item Edit item
Provide Feedback