This work investigates the decomposition of K‐feldspar into analcime under alkaline hydrothermal conditions. Two types of raw materials, potassic syenite powder and microcline crystal lumps, were used for hydrothermal treatment. Research techniques of minerals alteration path simulation, powder decomposition experiments, and specific observations were conducted. Results show that K‐feldspar did not alter into analcime directly under hydrothermal conditions, and instead, hydroxycancrinite was an important intermediate. Formation route of analcime from potassic syenite powder was derived as follows: syenite dissolution → hydroxycancrinite precipitation → hydroxycancrinite assembling → reversed recrystallization → analcime, where the assembling of hydroxycancrinite into analcime‐shaped spheres was the key step for analcime formation. Above all, a novel and different to natural reaction process with feldspar decomposition and analcime formation process was proposed.

中文翻译：

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NaOH溶液中钾长石的水热分解过程

这项工作研究了在碱性水热条件下钾长石分解为analcime的过程。水热处理使用了两种类型的原料：钾正长岩粉末和微斜晶体块。进行了矿物蚀变路径模拟，粉末分解实验和具体观察的研究技术。结果表明，钾长石在水热条件下不会直接转变为拟南芥，相反，羟基钙锰矿是重要的中间体。由钾正长岩粉末形成的无定形化合物的形成途径如下：正定体溶解→羟基斜铁矿沉淀→羟基斜铁矿的组装→反向再结晶→无碱金属，其中羟基斜铁矿到无环己酸形状的球的组装是形成无定形树脂的关键步骤。首先，