Crystal-Chemical Features of a Cation-Ordered Potassium Analog of Aqualite from the Kovdor Massif (Kola Peninsula)

IF 0.8 4区地球科学 Q3 GEOLOGY

Geology of Ore Deposits Pub Date : 2024-02-07 DOI:10.1134/s1075701523070085

R. K. Rastsvetaeva, N. V. Chukanov, I. V. Pekov, M. F. Vigasina

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Abstract

The chemical composition, crystal structure, and characteristics of the Raman spectrum of a highly hydrated aqualite-like mineral of the eudialyte group from the Kovdor massif (Kola Peninsula, Russia), in which potassium and hydronium group H₃O⁺ are the species-defining extraframework cations, are studied. The simplified formula of the mineral is (H₃O)₈Na₅K₂Zr₃Ca₆[Si₂₄O₆₉(OH)₃][Si₂]Mn(OH)₂Cl·2H₂O. It is characterized by space group R3 and unit-cell parameters a = 14.184(1), c = 30.797(1) Å, V = 5366.27(1) Å³. A specific feature of this mineral, which distinguishes it from all other representatives of the eudialyte group, is a high degree of order in the distribution of large extraframework cations (Na⁺, K⁺, Sr²⁺, Ba²⁺, Ln³⁺, and H₃O⁺) over split sites of the crystal structure. In the studied mineral, some oxonium ions form complexes with water molecules with extremely strong hydrogen bonds similar to those that are realized in proton hydrate complexes such as Zundel and Eigen cations.

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科夫多尔地块（科拉半岛）出产的阳离子有序钾类似水成岩的晶体化学特征

摘要研究了科夫多尔地块（俄罗斯科拉半岛）出产的一种高度水合含水岩类乌云石矿物的化学成分、晶体结构和拉曼光谱特征，其中钾和氢基团 H3O+ 是该矿物的决定性框架外阳离子。该矿物的简化公式为 (H3O)8Na5K2Zr3Ca6[Si24O69(OH)3][Si2]Mn(OH)2Cl-2H2O。它的空间群为 R3，单胞参数为 a = 14.184(1)，c = 30.797(1)埃，V = 5366.27(1)埃3。该矿物有别于所有其他柘榴石族代表矿物的一个特点是，框架外大阳离子（Na+、K+、Sr2+、Ba2+、Ln3+ 和 H3O+）在晶体结构分裂位点上的分布具有高度有序性。在所研究的矿物中，一些羰基离子与水分子形成络合物，其氢键极强，类似于质子水合物络合物（如 Zundel 和 Eigen 阳离子）中的氢键。

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来源期刊

Geology of Ore Deposits 地学-地质学

CiteScore

1.10

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Geology of Ore Deposits is a periodical covering the topic of metallic and nonmetallic mineral deposits, their formation conditions, and spatial and temporal distribution. The journal publishes original scientific articles and reviews on a wide range of problems in theoretical and applied geology. The journal focuses on the following problems: deep geological structure and geodynamic environment of ore formation; distribution pattern of metallogenic zones and mineral deposits; geology and formation environment of large and unique metallic and nonmetallic deposits; mineralogy of metallic and nonmetallic deposits; physicochemical and isotopic characteristics and geochemical environment of ore deposition; evolution of ore-forming systems; radiogeology and radioecology, economic problems in exploring, developing, and mining of ore commodities.