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The new mineral tomiolloite, Al12(Te4+ O3)5[(SO3)0.5(SO4)0.5](OH)24: A unique microporous tellurite structure

Citation

Missen, OP and Mills, SJ and Rumsey, MS and Spratt, J and Najorka, J and Kampf, AR and Thorne, B, The new mineral tomiolloite, Al12(Te4+ O3)5[(SO3)0.5(SO4)0.5](OH)24: A unique microporous tellurite structure, The American Mineralogist, 107, (12) pp. 2167-2175. ISSN 1945-3027 (2022) [Refereed Article]


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PDF (New mineral description of tomiolloite, an aluminium tellurite-sulfate mineral which forms puffballs of minuscule crystals. First aluminium tellurite mineral ever described.)
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DOI: doi:10.2138/am-2022-8368

Abstract

Tomiolloite (IMA2021-019) is a new aluminum tellurite sulfite-sulfate mineral discovered at the Bambolla mine, Moctezuma, Sonora, Mexico, a well-known tellurium (Te) mineral locality. Tomiolloite forms roughly spherical clusters of crystals comprised of very thin, needle-like crystals (1 μm diameter, ~40 μm length) around a core of small, stubbier, broken crystals. Tomiolloite is generally found growing on tellurite or quartz. The strongest powder X‑ray diffraction lines are [dobs (Iobs) (hkl)]: 11.667 (89) (100), 8.240 (38) (101), 4.107 (29) (202,211,121), 3.223 (100) (203,302,130), and 2.905 (37) (213,123,222,400). The empirical formula of tomiolloite, as determined by electron microprobe analysis, is (Al10.64Te61.01+ Fe30.31+ Zn0.04)Σ12(Te45.00+ Pb0.02)Σ5.02(S40.49+ S60.49+ Si0.02)Σ1.00O21.53[(OH)20.86Cl0.11]Σ20.97, which is simplified to the ideal formula Al12(Te4+O3)5[(SO3)0.5(SO4)0.5](OH)24. Significant Te6+ substitution for Al3+ is observed in tomiolloite, verified by X‑ray photoelectron spectroscopy and crystal-structure analysis. The structure of tomiolloite was determined using synchrotron single-crystal X‑ray diffraction, showing that tomiolloite is hexagonal and crystallizes in the space-group P63/m, with the unit-cell parameters a = 13.3360(19) , c = 11.604(2) , V = 1787.3(6) 3, and Z = 2. Tomiolloite has a unique microporous framework structure, which bears a slight similarity to that of zemannite, but it has a much larger cavity diameter (8.85 ). The framework is built from edge-sharing Mφ6 octahedra (M = Al3+ and Te6+), Te4+O3 trigonal pyramids, and Te4+O4 disphenoids. Mφ6 octahedra edge-share to form crankshaft-shaped chains along c, with Te4+On polyhedra filling notches in the crankshafts and providing linkages between adjacent chains. The framework has an overall positive charge, which is balanced by the presence of both sulfite (SO32−) trigonal pyramids and sulfate (SO42−) tetrahedra in the channels.

Item Details

Item Type:Refereed Article
Keywords:New mineral, crystal structure, tellurium oxysalt, microporous, synchrotron radiation, X-ray diffraction, Moctezuma, Sonora, Mexico; Microporous materials: crystal-chemistry, properties, and utilizations
Research Division:Earth Sciences
Research Group:Geology
Research Field:Mineralogy and crystallography
Objective Division:Mineral Resources (Excl. Energy Resources)
Objective Group:Other mineral resources (excl. energy resources)
Objective Field:Other mineral resources (excl. energy resources) not elsewhere classified
UTAS Author:Missen, OP (Dr Owen Missen)
ID Code:154973
Year Published:2022
Deposited By:CODES ARC
Deposited On:2023-01-20
Last Modified:2023-01-25
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