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A new Al-rich hydroxylian pseudorutile from Kalimantan, Indonesia

Ian E. Grey, Pierre Bordet, Nicholas C. Wilson, Raimunda Townend, Timothy J. Bastow and Michela Brunelli
A new Al-rich hydroxylian pseudorutile from Kalimantan, Indonesia
American Mineralogist (January 2010) 95 (1): 161-170


A new type of Al-rich hydroxylian pseudorutile (HPR), containing 64.6 wt% TiO (sub 2) , 12.1 wt% Al (sub 2) O (sub 3) , 10.9 wt% Fe (sub 2) O (sub 3) , and 12.4 wt% H (sub 2) O, has been identified in detrital heavy mineral concentrates from Central Kalimantan, Indonesia. The unusual translucent orange-colored grains have been characterized using electron microprobe analyses, thermal analyses, (super 27) Al MAS NMR, and synchrotron XRD studies including the use of differential pair distribution function analysis, to determine how the Al is incorporated. The results support a model in which diaspore-form AlOOH is incorporated into nanopores in the solid hydrogel-like mineral. The HPR matrix structure comprises disordered unit-cell scale intergrowths of diaspore-type and rutile-type structure elements, which have a close dimensional match to the diaspore structure, thus providing a suitable template for epitactic nucleation and growth of the diaspore. The average composition of the grains is [FeTi (sub 6) O (sub 10.8) (OH) (sub 5.4) ].1.8AlOOH.H (sub 2) O, where the formula within the square brackets represents the HPR matrix, and the AlOOH and H (sub 2) O occupy the intragrain pore volume.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 95
Serial Issue: 1
Title: A new Al-rich hydroxylian pseudorutile from Kalimantan, Indonesia
Affiliation: CSIRO Minerals, Clayton, South Austr., Australia
Pages: 161-170
Published: 201001
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 32
Accession Number: 2010-014202
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
S04°19'60" - N04°30'00", E108°55'00" - E119°00'00"
Secondary Affiliation: Universite Joseph Fourier, FRA, FranceDiamantina Laboratories, AUS, AustraliaCSIRO Materials Science and Engineering, AUS, AustraliaInstitut Laue Langevin, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201009
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