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Oxo-magnesio-hastingsite, NaCa2(Mg2Fe3+3 )(Al2Si6)O22O2, a new anhydrous amphibole from the Deeti volcanic cone, Gregory rift, northern Tanzania

Published online by Cambridge University Press:  05 July 2018

A. N. Zaitsev ,
E. Yu. Avdontseva ,
S. N. Britvin ,
A. Demény ,
Z. Homonnay ,
T. E. Jeffries ,
J. Keller ,
V. G. Krivovichev ,
G. Markl  and
N. V. Platonova
...Show all authors
A. N. Zaitsev*
Affiliation:
Department of Mineralogy, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, St. Petersburg, 199034 Russia Imaging and Analysis Centre, Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK
E. Yu. Avdontseva
Affiliation:
Department of Crystallography, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, St. Petersburg, 199034 Russia
S. N. Britvin
Affiliation:
Department of Crystallography, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, St. Petersburg, 199034 Russia
A. Demény
Affiliation:
Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45., H-1112, Budapest, Hungary
Z. Homonnay
Affiliation:
Institute of Chemistry, Faculty of Science, Eötvös Loránd University, Pázmány P. s. 1/A, 1117 Budapest, Hungary
T. E. Jeffries
Affiliation:
Imaging and Analysis Centre, Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK
J. Keller
Affiliation:
Institut für Geowissenschaften Mineralogie-Geochemie, Universität Freiburg, Albertstrasse 23b, D-79104 Freiburg, Germany
V. G. Krivovichev
Affiliation:
Department of Mineralogy, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, St. Petersburg, 199034 Russia
G. Markl
Affiliation:
Fachbereich Geowissenschaften, Universität Tübingen, Wilhelmstrasse 56, D-72074 Tübingen, Germany
N. V. Platonova
Affiliation:
Department of Crystallography, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, St. Petersburg, 199034 Russia
O. I. Siidra
Affiliation:
Department of Crystallography, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, St. Petersburg, 199034 Russia
J. Spratt
Affiliation:
Imaging and Analysis Centre, Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK
T. Vennemann
Affiliation:
Institute of Mineralogy and Geochemistry, University of Lausanne, Anthropole, CH-1015, Lausanne, Switzerland
*
* E-mail: [email protected]
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Abstract

Oxo-magnesio-hastingsite, ideally NaCa2(Mg2Fe3+3)(Al2Si6)O22O2, is a new anhydrous amphibole from the Deeti volcanic cone in the Gregory rift (northern Tanzania). The mineral occurs as megacrysts up to 12 cm in size in crystal-rich tuff. Oxo-magnesio-hastingsite is brown with a vitreous lustre and has a perfect {110} cleavage. The measured density is 3.19(1) g/cm3. Ferri-kaersutite is biaxial (–), α = 1.706 (2), β = 1.715(2), γ = 1.720(2) (Na light, 589 nm). 2V (calc.) = 73°. Dispersion: r > v, weak; orientation: Y = b; Z ^ c = 8°; pleochroism: strong, Z: dark brown, Y: brown, X: light brown. The average chemical formula of the mineral derived from electron microprobe analyses, Mössbauer spectroscopy and direct water determination is (Na0.67K0.33)Σ1.00(Ca1.87Na0.14Mn0.01)Σ2.02(Mg3.27Fe3+1.25Ti0.44Al0.08)Σ5.04(Al1.80Si6.20O22)(O1.40OH0.60)Σ2.00. It has monoclinic symmetry, space group C2/m and unit-cell parameters a = 9.8837(3), b = 18.0662(6), c = 5.3107(2) Å, b = 105.278(1)o, V = 914.77(5) Å3, Z = 2. The five strongest powder-diffraction lines [d in Å, (I/Io), hkl] are: 3.383 (62) (131), 2.708 (97) (151), 2.555 (100) (), 2.349 (29) () and 2.162 (36) (261). The isotopic composition of H and O, as well as the concentration of trace elements in oxo-magnesio-hastingsite suggest its formation from a melt originated from a mantle source metasomatized by slab-derived fluids.

Keywords

oxo-magnesio-hastingsiteoxo amphibole groupnew mineralMössbauer and IR spectroscopychemical compositionX-ray diffractioncrystal structureH and O isotopic compositionDeeti coneGregory riftTanzania
Type
Research Article
Information
Mineralogical Magazine , Volume 77 , Issue 6 , August 2013 , pp. 2773 - 2792
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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