<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>K‐natrolite is prepared by combining a 4 M KNO<sub>3</sub> solution with the natural mineral Na<sub>16</sub>Al<sub>16</sub>Si<sub>24</sub>O<sub>80 </sub>·16H<sub>2</sub>O in a 100:1 weight ratio for 24 h.</p> </abstract>