Crystal chemistry of ivanyukite-group minerals, A_3–xH_1+x[Ti₄O₄(SiO₄)₃](H₂O)_n (A = Na, K, Cu), (n = 6–9, x = 0–2): crystal structures, ion-exchange, chemical evolution

Abstract

This is a 'preproof' accepted article for Mineralogical Magazine. This version may be subject to change during the production process.

The AM-4 Family of Layered Titanosilicates: Single-Crystal-to-Single-Crystal Transformation, Synthesis and Ionic Conductivity

“…The H-exchanged K3 form loses all Zn and Mn and contains residual 0.01 apfu of K + and 0.01 apfu of Na + . The significant deficiency of the positive total charge is due to the substitution Na + + O 2− → □ + OH − and is consistent with our previous data [ 31 ]. Table 3 provides details of the analytical results for natural and acid-treated forms of lintisite and kukisvumite.…”

“…The massifs of phoidolites and nepheline syenites in Khibiny and Lovozero are the world’s largest, and are the main “suppliers” for the new minerals that serve as prototypes for creating new materials with functional properties [ 18 , 19 , 20 , 21 , 22 ]. The most representative mineral-mimetic materials are the following: Engelhard Titanium Silicate-4 (ETS-4) molecular sieve (analogue of zorite [ 23 ]) [ 24 ], the base for antimicrobial drugs [ 25 ]; Aveiro-Manchester-4 titanosilicate (Na-analogue of kukisvumite [ 26 ]) (AM-4) [ 27 ]; selective sorbent Cs from LRW analog of sitinakite [ 28 ] IONSIV IE-911 [ 29 , 30 ] and analogue of ivanyukite-Na [ 6 , 31 ]—synthetic ivanyukite (SIV) [ 32 , 33 ], one of the most effective sorbents of Cs, Sr, Co, Tl, Pb, Ag and REE from aqueous solutions [ 34 , 35 , 36 , 37 ].…”

Клинопироксены Из Щелочных И Силикатно-Карбонатных Пород Чикского Массива (Сангиленское Нагорье, Тыва)

“…В последние годы нами был накоплен значительный объем фактического материала по каркасными и слоистым -титано, -цирконосиликатам, показана эволюция минералов группы иванюкита (Panikorovskii et al, 2021), келдышита (Kabanova et al, 2020) и линтисита (Kalashnikova et al, 2023).…”

A Synthetic Analog of the Mineral Ivanyukite: Sorption Behavior to Lead Cations

“…The Raman spectra of SIV (ivanyukite-Na-T), SIV-Pb, and Pb-exchanged natural ivanyukite are shown in Figure 2. The assignments of the absorption bands were made by analogy with structurally related pharmacosiderite type compounds [23][24][25] and titanosilicates [26][27][28][29].…”

“…The crystal structure of Pb-exchanged ivanyukite (Figure 4a) possesses a pharmacosiderite structural topology and is based upon a topologically identical three-dimensional framework [28]. The main structural feature of ivanyukite-group minerals is the presence of cubane-like [Ti 4 O 4 ] 8+ clusters formed by four edge-sharing TiO 6 octahedra [29]. The [Ti 4 O 4 ] 8+ clusters are connected by sharing corners with SiO 4 tetrahedra to form a negatively charged [(TiO) 4 (SiO 4 ) 3 ] 4 − framework.…”