Two specimens of alluaudite-group minerals, badalovite NaNaMg(Mg,Fe³⁺)₂(AsO₄)₃ and calciojohillerite NaCaMgMg₂(AsO₄)₃, were taken on the Second scoria cone of the Great fissure Tolbachik eruption, Kamchatka Peninsula, Russia. The crystal structures of these monoclinic minerals have been refined by single-crystal X-ray diffraction. The thermal expansion of badalovite and calciojohillerite has been studied by high-temperature powder X-ray diffraction. The electrical conductivity was evaluated by impedance spectroscopy. The thermal expansion of these minerals is similar: maximum expansion is close to the longer diagonal of the parallelogram ac, minimum expansion is close to the shorter diagonal of the parallelogram ac. Thermal deformation of the ac plane is described in terms of the theory of shear deformation of monoclinic crystals. The results of shear deformations calculation and its consideration with thermal expansion are given. The shear deformations were calculated using bisectors of the ac parallelogram at different temperatures. The axes of shear deformation are located in the directions of the mutually perpendicular bisectors of ac parallelogram. The electrical conductivity of badalovite is ~ 3–4 times greater than for calciojohillerite in the studied temperature range (350–600 °C).

分别在堪察加半岛大裂隙Tolbachik喷发的第二个碎屑锥上采集了两个变石矿物的标本，分别为Badalovite NaNaMg（Mg，Fe ³⁺）₂（AsO ₄）₃和钙铝矾石NaCaMgMg ₂（AsO ₄）₃。俄罗斯。这些单斜晶矿物的晶体结构已通过单晶X射线衍射进行了精制。通过高温粉末X射线衍射研究了Badalovite和calciojohillerite的热膨胀。通过阻抗光谱法评价电导率。这些矿物的热膨胀类似：最大膨胀接近平行四边形ac的较长对角线最小膨胀接近平行四边形ac的较短对角线。交流平面的热变形是根据单斜晶体的剪切变形理论来描述的。给出了剪切变形的计算结果及其对热膨胀的考虑。使用交流平行四边形的等分线在不同温度下计算剪切变形。剪切变形轴位于ac平行四边形的相互垂直的二等分线的方向上。在所研究的温度范围（350–600°C）下，硅铝矾石的电导率约为钙硅钙铁石的3-4倍。