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Crystal structure of nobleite, CA[B (sub 6) O (sub 9) (OH) (sub 2) ].3H (sub 2) O, from Jarandol, Serbia

Ljiljana Karanovic, Aleksandra Rosic and Dejan Poleti
Crystal structure of nobleite, CA[B (sub 6) O (sub 9) (OH) (sub 2) ].3H (sub 2) O, from Jarandol, Serbia
European Journal of Mineralogy (October 2004) 16 (5): 825-833


The crystal structure of nobleite (a 14.580, b 8.0240, c 9.8486 Aa, beta 111.801 degrees , V 1069.7 Aa (super 3) , Z = 4, space group P2 (sub 1) /a) has been refined to R 0.0324. The fundamental building block (FBB) contains three BO (sub 4) tetrahedra and three BO (sub 3) coordination triangles. The three tetrahedra share one corner. Each six-membered B-O ring is formed by sharing corners among two tetrahedra and one triangle. The FBBs are further polymerized into sheets parallel to (100), with Ca cations in the holes in the sheets and water molecules between them.The Ca atom is coordinated by six O from the FBBs and three water molecules. The Ca polyhedron with coordination number 9 can be described as a distorted hexagonal bipyramid with one vertex split. All hydroxyl groups and water molecules form hydrogen bonds located mainly between sheets. These results show that nobleite is not isostructural wih tunellite.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 16
Serial Issue: 5
Title: Crystal structure of nobleite, CA[B (sub 6) O (sub 9) (OH) (sub 2) ].3H (sub 2) O, from Jarandol, Serbia
Affiliation: Faculty of Mining and Geology, Belgrade, Yugoslavia
Pages: 825-833
Published: 200410
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 19
Accession Number: 2004-084043
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 9 tables
N42°04'60" - N46°10'00", E18°55'00" - E23°00'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200424
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