Skip Nav Destination
GEOREF RECORD
Structure of a new upper-mantle, magnetoplumbite-type phase, Ba[Ti (sub 3) Cr (sub 4) Fe (sub 4) Mg]O (sub 19)
Ian E. Grey, Ian C. Madsen and Stephen E. Haggerty
Structure of a new upper-mantle, magnetoplumbite-type phase, Ba[Ti (sub 3) Cr (sub 4) Fe (sub 4) Mg]O (sub 19)
American Mineralogist (June 1987) 72 (5-6): 633-636
Structure of a new upper-mantle, magnetoplumbite-type phase, Ba[Ti (sub 3) Cr (sub 4) Fe (sub 4) Mg]O (sub 19)
American Mineralogist (June 1987) 72 (5-6): 633-636
Index Terms/Descriptors
- Africa
- Cape Province region
- Cape Province South Africa
- crystal structure
- harzburgite
- igneous rocks
- Kimberley South Africa
- mantle
- metasomatism
- mineralogy
- minerals
- natural materials
- new minerals
- Northern Cape Province South Africa
- order-disorder
- oxides
- peridotites
- phase equilibria
- plutonic rocks
- refinement
- South Africa
- Southern Africa
- space groups
- symmetry
- ultramafics
- upper mantle
- magnetoplumbite structure
Latitude & Longitude
Abstract
The new phase, ideally Ba(Ti (sub 3) Cr (sub 4) Fe (sub 4) Mg)O (sub 19) , is found in metasomatized lithosphere-derived harzburgite, in the Kimberley district of South Africa. It has hexagonal symmetry, space group P6 (sub 3) /mmc, with a 5.871(2), c 23.06(2) A. The crystal structure has been refined to R = 0.044 for 368 independent reflections collected on a diffractometer using MoKalpha radiation. The new mineral has magnetoplumbite-type structure, with a statistical disorder of the cations occupying the bipyramidal site, in positions displaced by 0.2 A on either side of the mirror plane.
ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 72
Serial Issue: 5-6
Title: Structure of a new upper-mantle, magnetoplumbite-type phase, Ba[Ti (sub 3) Cr (sub 4) Fe (sub 4) Mg]O (sub 19)
Affiliation: CSIRO, Div. Miner. Chem.,
Port Melbourne, Victoria,
Australia
Pages: 633-636
Published: 198706
Text Language: English
Publisher: Mineralogical Society of America,
Washington, DC,
United States
References: 9
Accession Number: 1987-083114
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 4 tables
S34°49'60" - S24°45'00", E16°25'00" - E30°15'00"
S28°45'00" - S28°45'00", E24°46'00" - E24°46'00"
Secondary Affiliation: Univ. Mass.,
USA,
United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1987
