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Figure 1
(a) A scatter plot and (b) a histogram of observed T–T distances in all chain-silicate minerals and selected synthetic compounds. All symmetrically unique T–T distances in the geometrical repeat unit of each mineral (or synthetic) were incorporated. Red lines represent the set maximum (3.210 Å) and minimum (2.910 Å) T–T distances allowed during embedding. In (a), black points represent Si4+–Si4+ distances and the blue, purple, green, red, pink and yellow points represent T–T distances that involve the T cations Al3+, V5+, Be2+, B3+, Fe3+ and Li+, respectively.

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ISSN: 2053-2733
Volume 80| Part 3| May 2024| Pages 258-281
https://doi.org/10.1107/S2053273324002432
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