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The model is based on a simple set of reactions and contains a single adjustable parameter p (0 \u2264 p \u2264 1). The latter is found from 27Al solid-state nuclear magnetic resonance (NMR) experiments in the regime where R = x\/y \u2265 1, aided by new experiments on the magnesium and zinc aluminosilicate systems. The parameter p decreases linearly as the cation field strength of M+ or M2+ increases, as per the observation previously made for the degree of aluminum avoidance [Lee et al., J. Phys. Chem. C 120, 737 (2016)]. The results indicate that as the cation field strength increases, there are less fourfold coordinated aluminum atoms to contribute toward the glass network, and Al\u2013O\u2013Al bonds become more prevalent in a progressive breakdown of Loewenstein\u2019s aluminum avoidance rule. The model gives a good account of the composition-dependent fraction of non-bridging oxygen (NBO) atoms for R \u2265 1, as assessed from the results obtained from solid-state NMR experiments. An extension of the model to (M2O3)x(Al2O3)y(SiO2)1\u2212x\u2212y glasses leads, however, to an excess of NBO atoms, the proportion of which can be reduced by invoking network-forming fivefold coordinated Al atoms and\/or oxygen triclusters. The model provides a benchmark for predicting the structure-related properties of aluminosilicate materials and a starting point for predicting the evolution in the structure of these materials under the extreme conditions encountered in the Earth\u2019s interior or in processes such as sharp-contact loading.<\/jats:p>","DOI":"10.1063\/5.0079607","type":"journal-article","created":{"date-parts":[[2022,2,9]],"date-time":"2022-02-09T13:02:13Z","timestamp":1644411733000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":23,"title":["Structural model for amorphous aluminosilicates"],"prefix":"10.1063","volume":"156","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2247-7171","authenticated-orcid":false,"given":"Lawrence V. 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