The thermal behaviour of a fluor-elbaite from Minas Gerais (Brazil) was investigated at room pressure through in situ high-temperature X-ray powder diffraction (HT-XRPD), until the breakdown conditions were reached. The variations of fluor-elbaite structural parameters (unit-cell parameters and mean bond distances) were monitored together with site occupancies, and two main internal reactions were identified: the thermally-induced Fe oxidation process counterbalanced by (OH)^– deprotonation, which starts at 500 °C (773 K), followed by a partial intracrystalline Fe–Al exchange between the octahedrally-coordinated Y and Z sites. The fluor-elbaite breakdown reaction occurs between 850 °C (1123 K) and 900 °C (1173 K). The breakdown products were identified at room temperature by XRPD and the breakdown reaction can be described by the following reaction: tourmaline → B-bearing mullite + hematite + spinel + B-poor (Na, Li, H₂O)-bearing glass. Boromullite itself was not observed in the final heating products, and the B-bearing mullite from the breakdown reaction exhibited unit-cell parameters a = 7.5382(2) Å, b = 7.6749(2) Å, c = 2.8385(1) Å, V = 164.22(1) ų (space group Pbam) consistent with an approximate Al_8.5B_1.5Si₂O₁₉ composition.

来自Minas Gerais（巴西）一氟-elbaite的热行为在室温压力通过原位高温X射线粉末衍射（H调查Ť -XRPD），直到被达到击穿条件。氟橡胶结构参数（晶胞参数和平均键距）的变化与位点占用率一起监测，并确定了两个主要的内部反应：由（OH）平衡的热诱导铁氧化过程^-去质子化，开始在 500 °C (773 K)，然后在八面体配位的Y和Z之间发生部分晶内 Fe-Al 交换网站。氟橡胶分解反应发生在 850 °C (1123 K) 和 900 °C (1173 K) 之间。分解产物在室温下通过 XRPD 鉴定，分解反应可由以下反应描述：电气石 → 含 B 莫来石 + 赤铁矿 + 尖晶石 + 含 B-贫 (Na, Li, H ₂ O) 玻璃。在最终加热产物中没有观察到硼莫来石本身，并且来自分解反应的含 B 莫来石显示出晶胞参数a  = 7.5382(2) Å, b  = 7.6749(2) Å, c  = 2.8385(1) Å, V  = 164.22(1) Å ³ (空间群Pbam ) 与近似的 Al _8.5 B _1.5 Si 一致₂ O ₁₉组成。