New data on the crystal chemistry of the natural two-layer aluminosilicates latiumite and tuscanite

Author:

Zubkova Natalia V.ORCID,Chukanov Nikita V.,Varlamov Dmitry A.,Vigasina Marina F.,Pekov Igor V.,Ksenofontov Dmitry A.,Pushcharovsky Dmitry Yu.

Abstract

The crystal chemistry of the natural microporous two-layer aluminosilicates (2D zeolites) latiumite and tuscanite is re-investigated based on new data on the chemical composition, crystal structures, and infrared and Raman spectra. The CO3 2−-depleted and P- and H-enriched samples from Sacrofano paleovolcano, Lazio, Italy, are studied. Both minerals are monoclinic; latiumite P21, a = 12.0206 (3), b = 5.09502 (10), c = 10.8527 (3) Å, β = 107.010 (3)°, V = 635.60 (3) Å3 and tuscanite P21/a, a = 23.9846 (9), b = 5.09694 (15), c = 10.8504 (4) Å, β = 107.032 (4)°, V = 1268.26 (8) Å3. The obtained crystal chemical formulae (Z = 2 for both minerals) are [(H3O)0.48(H2O)0.24K0.28](Ca2.48K0.21Na0.21Sr0.06Mg0.04)(Si2.86Al2.14O11)[(SO4)0.70(PO4)0.20](CO3)0.10 for latiumite and [(H3O)0.96(H2O)0.58K0.46](Ca4.94K0.44Na0.45Sr0.09Mg0.08)(Si5.80Al4.20O22)[(SO4)1.53(PO4)0.33](CO3)0.14 for tuscanite. These minerals are dimorphous. Both latiumite and tuscanite show distinct affinity for the PO4 3− anion. Hydrolytic alteration of these minerals results in partial leaching of potassium accompanied by protonation and hydration which is an important precondition for the existence of ion/proton conductivity of related materials.

Funder

Russian Science Foundation

Publisher

International Union of Crystallography (IUCr)

Subject

Materials Chemistry,Metals and Alloys,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

Reference35 articles.

1. Crystal structure and topological features of manganonaujakasite, a mineral with microporous heteropolyhedral framework related to AlPO-25 (ATV)

2. Bonaccorsi, E., Ventura, M. & Merlino, S. (2005). GeoItalia 2005, Quinto Forum Italiano di Scienze della Terra. 21-23 September 2005, Spoleto. Abstract 00-01.

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