natrolitegroup
The natrolite group is a subdivision of the zeolite family of minerals defined by the natrolite-type aluminosilicate framework. Members are hydrated aluminosilicates formed by linking AlO4 and SiO4 tetrahedra to create a porous three-dimensional structure that hosts water molecules and exchangeable cations in its channels. The idealized formula for natrolite is Na2Al2Si3O10·2H2O, but members vary in dominant cations such as sodium, calcium, or others, producing different chemical compositions within the group.
Structure and properties: The minerals crystallize in monoclinic or other crystal systems depending on the member,
Occurrence and formation: Natrolite-group minerals form as secondary alteration products in volcanic rocks such as basalts
Distribution and significance: They are widely distributed in zeolite deposits worldwide and are of interest for