1. A group of microporous aluminosilicate minerals belonging to the zeolite family, characterized by a framework structure that allows water and small molecules to be absorbed and released.
Usage: mineralogy; plural form; singular is heulandite; technical/scientific term

Examples

• Heulandites are commonly found in volcanic rocks and are valued for their ion-exchange properties.
• The heulandites in this mineral sample show excellent water absorption capacity.
• Geologists study heulandites to understand the alteration of volcanic materials.
• Heulandites have applications in water purification and air filtration systems.
• The crystal structure of heulandites makes them useful as molecular sieves in industrial processes.