The thermal behaviour of fedorite from the Murun massif, Russia, has been investigated by means of electron probe microanalysis (EPMA), differential thermal analysis (DTA), thermogravimetry (TG), in situ high-temperature single-crystal X-ray diffraction (HT-SCXRD), ex situ high-temperature Fourier-transform infrared spectroscopy (HT-FTIR). The empirical chemical formula of the sample of fedorite studied is: (Na1.56K0.72Sr0.12)Σ2.40(Ca4.42Na2.54Mn0.02Fe0.01Mg0.01)Σ7.00(Si15.98Al0.02)Σ16.00(F1.92Cl0.09)Σ2.01(O37.93OH0.07)Σ38.00⋅2.8H2O. The TG curve provides a total mass decrease of ~5.5%, associated with dehydration and defluorination processes from 25 to 1050°C. Fedorite crystallises in space group P$\bar{1}$ and has: a = 9.6458(2), b = 9.6521(2), c = 12.6202(4) Å, α = 102.458(2), β = 96.2250(10), γ = 119.9020(10)° and cell volume, V = 961.69(5) Å3. The HT-SCXRD was carried out in air in the 25–600°C range. Overall, a continuous expansion of the unit-cell volume was observed although the c cell dimension slightly decreases in the explored temperature range. Structure refinements indicated that the mineral undergoes a dehydration process with the loss of most of the interlayer H2O from 25 to 300°C. The HT-FTIR spectra confirmed that fedorite progressively dehydrates until 700°C.

通过电子探针显微分析（EPMA）、差热分析（​​DTA）、热重分析（TG）、原位高温单晶 X 射线衍射（ HT-SCXRD）、异位高温傅里叶变换红外光谱（HT-FTIR）。研究的软辉石样品的经验化学式为： (Na 1.56 K 0.72 Sr 0.12 ) Σ2.40 (Ca 4.42 Na 2.54 Mn 0.02 Fe 0.01 Mg 0.01 ) Σ7.00 (Si 15.98 Al 0.02) Σ16.00 (F 1.92 Cl 0.09 ) Σ2.01 (O 37.93 OH 0.07 ) Σ38.00 ⋅2.8H 2 O。TG 曲线提供约 5.5% 的总质量下降，与从 25 到 25 的脱水和脱氟过程相关。 1050°C。辉辉石在空间群P $\bar{1}$中结晶，具有：a = 9.6458(2), b = 9.6521(2), c = 12.6202(4) Å, α = 102.458(2), β = 96.2250(10 ), γ = 119.9020(10)° 和细胞体积, V = 961.69(5) Å 3。HT-SCXRD 在 25-600°C 范围内的空气中进行。总体而言，尽管晶胞尺寸在探索的温度范围内略有减小，但观察到晶胞体积的持续膨胀。结构细化表明，矿物在 25 至 300°C 之间经历了脱水过程，损失了大部分层间 H 2 O。HT-FTIR 光谱证实，软石英在 700°C 之前会逐渐脱水。