(mineral) Any of several minerals, aluminosilicates of sodium, potassium, calcium or magnesium, that have a porous structure (originally, those which swelled and gave off water when heated); they are used in water softeners and in ion exchange chromatography.
(mineral) Any of several impure clay minerals consisting mostly of montmorillonite.
A term now used to designate any one of a family of minerals, hydrous silicates of alumina, with lime, soda, potash, or rarely baryta. Here are included natrolite, stilbite, analcime, chabazite, thomsonite, heulandite, and others. These species occur of secondary origin in the cavities of amygdaloid, basalt, and lava, also, less frequently, in granite and gneiss. So called because many of these species intumesce before the blowpipe.
A porous clay formed by the decomposition of volcanic ash that swells 5 to 6 times its original volume in the presence of water.
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
an absorbent aluminum silicate clay formed from volcanic ash.
Zeolites are microporous, aluminosilicate minerals commonly used as commercial adsorbents and catalysts. The term zeolite was originally coined in 1756 by Swedish mineralogist Axel Fredrik Cronstedt, who observed that rapidly heating a material, believed to have been stilbite, produced large amounts of steam from water that had been adsorbed by the material.
an absorbent aluminum silicate clay formed from volcanic ash
Bentonite () is an absorbent swelling clay consisting mostly of montmorillonite. It usually forms from weathering of volcanic ash in seawater, which converts the volcanic glass present in the ash to clay minerals.