Figure 2
(a) A scatter plot and (b) a histogram of observed T⋯T separations in all chain-silicate minerals and selected synthetic compounds. All symmetrically unique T⋯T separations up to 6.5 Å in the geometrical repeat unit of each mineral (or synthetic) were incorporated. Red lines represent the set minimum (3.713 Å) T⋯T separations permitted during embedding. In (a), black points represent Si⋯Si separations and the blue, purple, green, red, pink and yellow points represent T⋯T separations that involve the T cations Al, V, Be, B, Fe and Li, respectively. |