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Cs-bearing beryl evolving to pezzottaite from the Julianna pegmatitic system, SW Poland

Adam Pieczka, Eligiusz Szeleg, Adam Szuszkiewicz, Bozena Golebiowska, Sylwia Zelek, Slawomir Ilnicki, Krzysztof Nejbert and Krzysztof Turniak
Cs-bearing beryl evolving to pezzottaite from the Julianna pegmatitic system, SW Poland (in A tribute to Frank Christopher Hawthorne, Lee A. Groat (prefacer))
The Canadian Mineralogist (January 2016) 54 (1): 115-124


Beryl is a common accessory mineral in the hybrid NYF + LCT Julianna pegmatite system, exposed in a quarry at Pilawa Gorna in Lower Silesia, SW Poland. In pods with the LCT-type mineralization it forms zoned, yellowish, white to pinkish, Cs-enriched crystals (up to 16.56 Cs (sub 2) O wt.%) with compositions at the crystal rims evolving to pezzottaite, i.e, a Cs-dominant mineral of the beryl group, with the empirical formula: (Cs (sub 0.755) Na (sub 0.059) Ca (sub 0.024) K (sub 0.008) Rb (sub 0.006) (sub 0.148) ) (sub Sigma 1) (Be (sub 1.993) Li (sub 0.961) Si (sub 0.046) ) (sub Sigma 3) (Al (sub 1.993) Mn (sub 0.007) ) (sub Sigma 2) [Si (sub 6) O (sub 18) ]. Textural evidence indicates that the Cs-bearing beryl crystallized from a residual melt with high contents of fluxes and pezzottaite from hydrothermal fluids with Cs concentrations increased significantly due to crystallization of cleavelandite that suppressed the activity of Na. The Julianna pegmatitic system at Pilawa Gorna is the third confirmed occurrence of pezzottaite worldwide. The mineral, similarly to pezzottaite in the type occurrence in Madagascar, formed in a pegmatite with a hybrid NYF + LCT signature.

ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 54
Serial Issue: 1
Title: Cs-bearing beryl evolving to pezzottaite from the Julianna pegmatitic system, SW Poland
Title: A tribute to Frank Christopher Hawthorne
Affiliation: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica, Department of Mineralogy, Petrography and Geochemistry, Cracow, Poland
Affiliation: University of British Columbia, Department of Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada
Pages: 115-124
Published: 201601
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 25
Accession Number: 2017-006096
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N50°42'12" - N50°42'12", E16°44'12" - E16°44'12"
Secondary Affiliation: University of Silesia, POL, PolandUniversity of Wroclaw, POL, PolandUniversity of Warsaw, POL, Poland
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201705
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