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The high‐temperature (HT) behaviour of lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4, was studied using in situ powder X‐ray diffraction in the temperature range 25–1000°C and ex situ single‐crystal X‐ray diffraction of 17 crystals quenched from different temperatures. HT iron oxidation associated with dehydroxylation starts at 450°C, similar to other ferrous‐hydroxy‐rich heterophyllosilicates such...
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