Delhayelite and Mountainite Mineral Families: Crystal Chemical Relationship, Microporous Character and Genetic Features
Many minerals show the properties commonly named “zeolitic”: ion exchange and leaching, sorption of gases and organic molecules, reversible hydration, etc. The most well-known examples are aluminosilicate zeolites, clay minerals and pyrochlores. Besides them, several other large groups of minerals are now in focus of research as potential microporous materials or their prototypes. First, there are Ti-, Zr-, Nb-silicates with heteropolyhedral frameworks. This paper is devoted to other minerals of this interest. There are two related families of natural silicates with structures based on Si,O or Al,Si,O tetrahedral layers and columns of edge-shared Ca-centered octahedra.
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