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Na-Li-Be-rich cordierite from the Murzinka pegmatite field, middle Urals, Russia

Ella V. Sokol, Yurii V. Seryotkin and Taras A. Bul'bak
Na-Li-Be-rich cordierite from the Murzinka pegmatite field, middle Urals, Russia
European Journal of Mineralogy (August 2010) 22 (4): 565-575


Na-Li-Be-rich cordierite (0.16 Be, 0.05 Li, and 0.21-0.31 Na atom p.f.u.) enriched in Rb (64 ppm), Cs (217 ppm), Ce (26 ppm) and U (56 ppm) has been discovered in an Mg-enriched vein of granite pegmatite in the Murzinka field of beryllian granitic pegmatites in the Middle Ural Mts of Russia. The crystal-chemical formula of the cordierite, based on the refined structure, is Na (sub 0.24) (super Ch0) (H (sub 2) O) (sub 0.64) (super Ch1/4) (Mg (sub 1.66) Fe (sub 0.26) (super 2+) Li (sub 0.06) Mn (sub 0.02) ) (sub Sigma 2.00) (super M) [(Al (sub 1.80) Be (sub 0.16) Fe (sub 0.04) (super 2+) Si (sub 1.00) ) (sub Sigma 3.00) (super T1) (Si (sub 4.00) Al (sub 2.00) ) (sub Sigma 6.00) (super T2) O (sub 18) ]. The molecules in the channels are dominated by class II and class I H (sub 2) O (2.21 wt%). According to the paragenesis, chemical composition and structural features of this corderite, the occurrence is typical for peraluminous granitic pegmatite. Cordierite within the Murzinka pegmatite field is generally restricted to pegmatite veins contaminated by interaction with peraluminous or silica-undersaturated country rocks. Cordierite, together with or instead of beryl, appears to have crystallized from aqueous weakly acidic chloride solutions rich in Na. The preservation of cordierite from subsequent replacement is achieved by low fluid-to-rock ratio.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 22
Serial Issue: 4
Title: Na-Li-Be-rich cordierite from the Murzinka pegmatite field, middle Urals, Russia
Affiliation: Russian Academy of Sciences, Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 565-575
Published: 201008
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 57
Accession Number: 2010-081057
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N53°00'00" - N60°00'00", E56°30'00" - E62°30'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201043
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