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GEOREF RECORD

Crystal structure of kanemite, NaHSi (sub 2) O (sub 5) .3H (sub 2) O, from the Aris Phonolite, Namibia

Laurence A. J. Garvie, Bertrand Devouard, Thomas L. Groy, Fernando Camara and Peter R. Buseck
Crystal structure of kanemite, NaHSi (sub 2) O (sub 5) .3H (sub 2) O, from the Aris Phonolite, Namibia
American Mineralogist (August 1999) 84 (7-8): 1170-1175

Abstract

Kanemite was studied by single-crystal X-ray diffraction. The mineral, ideally NaHSi (sub 2) O (sub 5) .3H (sub 2) O, is orthorhombic (space group Pbcn); unit-cell parameters are a = 4.946(3), b = 20.502(15), c = 7.275(3) Aa, with Z = 4. The structure is solved and refined to an R value of 0.058 for 825 independent reflections. The arrangement of atoms consists of alternating (010) sheets of corrugated [Si (sub 2) O (sub 4) OH] (super n-) (sub n) and hydrated Na. The silicate sheets contain six-membered rings of HOSiO (sub 3) -SiO (sub 4) units. Sodium atoms coordinate to six water molecules, forming layers of distorted octahedra. Residual electron densities were located that give reasonable positions for four H atoms. One H is part of a silanol group, and the other three H atoms are associated with water bonded to Na. Bonding between the silicate and Na sheets is through hydrogen bonding from H of the Na layer to O of the silicate sheet.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 84
Serial Issue: 7-8
Title: Crystal structure of kanemite, NaHSi (sub 2) O (sub 5) .3H (sub 2) O, from the Aris Phonolite, Namibia
Affiliation: Arizona State University, Department of Geology, Tempe, AZ, United States
Pages: 1170-1175
Published: 199908
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 31
Accession Number: 1999-066024
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
S22°34'00" - S22°34'00", E17°06'00" - E17°06'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 199922
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