Textural relations and chemical composition of minerals from a pollucite + harmotome + chabazite nodule in the Věžná I pegmatite, Czech republic
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00106621" target="_blank" >RIV/00216224:14310/18:00106621 - isvavai.cz</a>
Alternative codes found
RIV/00094862:_____/18:N0000031
Result on the web
<a href="http://dx.doi.org/10.3749/canmin.1800014" target="_blank" >http://dx.doi.org/10.3749/canmin.1800014</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3749/canmin.1800014" target="_blank" >10.3749/canmin.1800014</a>
Alternative languages
Result language
angličtina
Original language name
Textural relations and chemical composition of minerals from a pollucite + harmotome + chabazite nodule in the Věžná I pegmatite, Czech republic
Original language description
Minerals and their textural relations from a pollucite + harmotome + chabazite nodule (PHC) enclosed in a volumetrically negligible albite-pollucite unit (1-2 dm(3)) in the Veznz I beryl-columbite pegmatite were examined by EMP and XRD. The albite-pollucite unit consists of a dominant albite-lepidolite-topaz subunit (Ab + Qz + Kf + Ms + Lpd + Tpz) as a matrix surrounding minor nodular subunits: the examined PHC and triplite-apatite nodules. Small vugs with crystals of harmotome and chabazite growing from the PHC nodule and polylithionite with sokolovaite rims, albite, fluor-elbaite, and K-feldspar extending from the host albite-lepidolite-topaz subunit are locally developed at the margin. Several textural/paragenetic types of the individual minerals in the PHC were distinguished from center to margin of the nodule and vugs. The minerals exhibit very complicated textural relations varying from evident replacement of early pollucite by analcime to evident replacement of pollucite-analcime by late zeolites (hannotome + chabazite). Ilowever, the pollucite types have almost identical compositions and underwent strong analcimization along the contact with the albite-lepidolite-topaz subunit. Harmotome evolves from K-rich harmotome I (harmotome > phillipsite-K) via Ca,K-moderate harmotome II to Ca,K-poor and Ba-rich harmotome III and chabazite evolves from Ca-rich chabazite I via slightly K-enriched chabazite Il to moderately K-enriched chabazite III (chabazite-Ca > chabazite-K) from center to margin and vugs, respectively. Pollucite was replaced by the assemblage harmotome + chabazite according to the simplified equation pollucite + Ba + 2Ca + 25 H2O = harmotome + chabazite. The temperatures of the processes leading to the assemblage pollucite + analcime + harmotome + chabazite in the PHC were inferred from the experimental and empirical P-T stabilities of the minerals: primary pollucite T > similar to 350 degrees C, analcimization T < similar to 150 degrees C, harmotome + chabazite T < similar to 100-150 degrees C.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Canadian Mineralogist
ISSN
0008-4476
e-ISSN
1499-1276
Volume of the periodical
56
Issue of the periodical within the volume
4
Country of publishing house
CA - CANADA
Number of pages
18
Pages from-to
375-392
UT code for WoS article
000451744300003
EID of the result in the Scopus database
2-s2.0-85055792479