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The structural chemistry of kalipyrochlore, a "hydropyrochlore"

T. S. Ercit, F. C. Hawthorne and P. Cerny
The structural chemistry of kalipyrochlore, a "hydropyrochlore"
The Canadian Mineralogist (June 1994) 32, Part 2: 415-420

Abstract

The crystal structure of kalipyrochlore from the Lueshe carbonatite, Zaire (Fd3m, a 10.604 Aa), has been refined to R 1.62%. On the basis of XRD and EPMA data, the formula is ([H (sub 2) O] (sub 0.99) Sr (sub 0.05) Ca (sub 0.01) )(Nb (sub 1.80) Ti (sub 0.20) )- (O (sub 4.06) OH (sub 1.94) )([H (sub 2) O] (sub 0.86) K (sub 0.14) ), leading to the idealized formula Nb (sub 2) (O,OH) (sub 6<P6M><P255MI>p) H (sub 2) O, where p up to 1.75. Kalipyrochlore is extremely deficient in A cations, such that the dominant occupant of this site is H (sub 2) O; it has some OH at the site normally occupied only by O, and has >> 1 H (sub 2) O group pfu. The maximum H (sub 2) O content ranges from 1.00 pfu for ideal pyrochlores (two A cations pfu) to 1.75 H (sub 2) O pfu for defect pyrochlores (no A cations).


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 32, Part 2
Title: The structural chemistry of kalipyrochlore, a "hydropyrochlore"
Affiliation: Canadian Museum of Nature, Research Division, Ottawa, ON, Canada
Pages: 415-420
Published: 199406
Text Language: English
Summary Language: French
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
Accession Number: 1996-021555
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 tables
S13°00'00" - N05°15'00", E12°00'00" - E32°00'00"
Secondary Affiliation: University of Manitoba, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199608
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