One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing rocks that formed at the lowest temperatures and pressures associated with regional metamorphism. Typical minerals in these facies include the zeolites, albite, and quartz.

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Any member of a family of hydrated aluminosilicate minerals that have a framework structure enclosing interconnected cavities occupied by large metal cations (positively charged ions)—generally sodium, potassium, magnesium, calcium, and barium—and water molecules. The ease of movement of ions and water within the framework allows reversible dehydration and cation exchange, properties that are exploited in water softeners and molecular sieves for pollution control, among other uses.

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