NDLI: Crystal chemistry of a Ba-dominant analogue of hydrodelhayelite and natural ion-exchange transformations in double- and triple-layer phyllosilicates in post-volcanic systems of the Eifel region, Germany

Content Provider	Springer Nature Link
Author	Zubkova, N. V. Chukav, N. V. Pekov, I. V. Turchkova, A. G. Lykova, I. S. Schüller, W. Ternes, B. Pushcharovsky, D. Yu.
Copyright Year	2016
Abstract	A Ba-dominant (Ba > K) analogue of hydrodelhayelite (BDAH) from Löhley (Eifel Mts., Rhineland-Palatinate, Germany) and Ba-enriched varieties of related double- and triple-layer phyllosilicates from Eifel are studied. The crystal structure of BDAH was solved by direct methods and refined to R = 0.0698 [1483 unique reflections with I > 2σ(I)]. It is orthorhombic, Pmmn, a = 23.9532(9), b = 7.0522(3), c = 6.6064(3) Å, V = 1115.97(8) Å3, Z = 2. The structure is based upon delhayelite-type double-layer tetrahedral blocks [(Al,Si)4Si12O34(OH,O)4] connected by chains of (Ca,Fe)-centered octahedra. Ba2+ and subordinate K+ occur at partially vacant sites in zeolitic channels within the tetrahedral blocks. The crystal-chemical formula of BDAH is: (Ba0.42K0.34□0.24)(Ca0.88Fe0.12)2(□0.90Mg0.10)2[Si6(Al0.5Si0.5)2O17(OH0.71O0.29)2]⋅6H2O. The formation of BDAH and Ba-rich varieties of altered delhayelite/fivegite, günterblassite and hillesheimite is considered as a result of leaching of Na, Cl, F and, partially, K and Ca accompanied with hydration and the capture of Ba as a result of natural ion exchange. These minerals are structurally a “bridge” between single-layer phyllosilicates and zeolites having the open three-dimensional tetrahedral Al-Si-O frameworks.
Starting Page	885
Ending Page	893
Page Count	9
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	110
Issue Number	6
e-ISSN	14381168
Language	English
Publisher	Springer Vienna
Publisher Date	2016-03-29
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineralogy Inorganic Chemistry Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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