Skrzynska, Katarzyna; Cametti, Georgia; Galuskina, Irina; Vapnik, Yevgeny; Galuskin, Evgeny (2022). Flörkeite, (K3Ca2Na)[Al8Si8O32]·12H2O: A Rare Zeolite from Pyrometamorphic Rocks of the Hatrurim Complex, Israel. Lithosphere, 2022(1) Geological Society of America 10.2113/2022/1343791
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Flörkeite, a rare zeolite with PHI (phillipsite) framework type, was found in numerous amygdaloidal voids in pyrometamorphic
rocks of the Hatrurim Basin, Hatrurim Complex, Israel. This is the second reported occurrence of flörkeite previously found in a
Ca-rich xenolith from a quarry at the Bellerberg volcano near Ettringen, East Eifel volcanic area, Germany. The mineral with
the empirical crystal chemical formula (K2.91Ca2.00Na0.91)[Al7.96Si8.04O31.94]·12H2O (P-1, no. 2, a = 19:9366 ð2Þ, b = 14:2517 ð1Þ,
c = 8:89350 ð10ÞÅ, α = 88:2480 ð1Þ, β = 125:0960 ð10Þ, γ = 89:6350 ð10Þ, V = 2019:19 ð4ÞÅ3, and R = 3:41%) did not show
significant differences with respect to that of the type locality. The Raman spectrum of flörkeite is here reported for the first
time. No significant differences are noticed compared to phillipsite-K. The main band ~470 cm-1, characteristic of the PHI-type
structures, is independent on framework order and Si/Al ratio. The zeolite mineralization of amygdules in pyrometamorphic rocks
results from meteoric water circulations in Al-rich rocks during their cooling. The crystallization sequence of zeolite corresponds to
the Ca/(K+Na) ratio decrease. Flörkeite formed at the end of a low-temperature crystallization sequence, indicating the
predominant role of potassium in crystallization. The occurrence of flörkeite in different pyrometamorphic rocks implies the
relatively uniform, regional mineral-forming conditions, and open hydrologic system of zeolitization. In pyrometamorphic rocks of
the Hatrurim Basin, the process of zeolitization is characterized by low silica activity and high pH conditions.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Institute of Geological Sciences > Mineralogy 08 Faculty of Science > Institute of Geological Sciences |
UniBE Contributor: |
Cametti, Georgia |
Subjects: |
500 Science > 550 Earth sciences & geology 500 Science > 540 Chemistry |
ISSN: |
1941-8264 |
Publisher: |
Geological Society of America |
Language: |
English |
Submitter: |
Georgia Cametti |
Date Deposited: |
29 Mar 2023 07:59 |
Last Modified: |
29 Mar 2023 23:28 |
Publisher DOI: |
10.2113/2022/1343791 |
BORIS DOI: |
10.48350/180812 |
URI: |
https://boris.unibe.ch/id/eprint/180812 |
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