An absorbent material (in the form of small pellets) used in low-temperature cryostats to trap gases released gradually after active pumping has ceased See outgassing
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
A term now used to designate any one of a family of minerals, hydrous silicates of alumina, with lime, soda, potash, or rarely baryta
Any of several minerals, aluminosilicates of sodium, potassium, calcium or magnesium, that have a porous structure; they are used in water softeners and in ion exchange chromatography
Crystalline porous aluminosilicate, hydrated and with alkali and alkaline-earth metals It forms a tetrahedral framework
Hydrous aluminum-sodium silicate in porous granules, capable of exchanging its base (sodium) for calcium or magnesium, and of expelling the calcium or magnesium in favor of sodium again by treatment with salt [Top]
A group of hydrated sodium aluminosilicates, either natural or synthetic, with ion exchange properties (See gel zeolite, greensand )
any of a family of glassy minerals analogous to feldspar containing hydrated aluminum silicates of calcium or sodium or potassium; formed in cavities in lava flows and in plutonic rocks
Any of a group of hydrated silicates of aluminum, having sodium, calcium, potassium as their chief metals Zeolites are often white or colorless, and are remarkable for the ease with which they take up or lose water molecules Zeolites are often found as crystals in cavities in basalt, and as authigenic minerals in tuffs Zeolites are valuable economic minerals
A natural or synthetic hydrated aluminosilicate with an open three-dimensional crystal structure in which water molecules are held; often called molecular sieves
Any of a large family of crystalline metal oxide materials characterized by the presence of extensive regular interconnected pore systems Most are based on mixtures of aluminum and silicon oxides, while others have phosphorous and other elements as well See Molecular Sieve
These species occur of secondary origin in the cavities of amygdaloid, basalt, and lava, also, less frequently, in granite and gneiss
Here are included natrolite, stilbite, analcime, chabazite, thomsonite, heulandite, and others
A naturally occurring ore which will absorb ammonia and soften water It is only effective in fresh water