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An example of the mineral formula of a zeolite is: Na 2 Al 2 Si 3 O 10 ·2H 2 O, the formula for natrolite. Natural zeolites form where volcanic rocks and ash layers react with alkaline groundwater. Zeolites also crystallize in post-depositional environments over periods ranging from thousands to millions of years in shallow marine basins.
Faujasite (FAU-type zeolite) is a mineral group in the zeolite family of silicate minerals.The group consists of faujasite-Na, faujasite-Mg and faujasite-Ca. They all share the same basic formula (Na 2,Ca,Mg) 3.5 [Al 7 Si 17 O 48]·32(H 2 O) by varying the amounts of sodium, magnesium and calcium. [1]
Clinoptilolite is a natural zeolite composed of a microporous arrangement of silica and alumina tetrahedra. It has the complex formula (Na,K,Ca) 2–3 Al 3 (Al,Si) 2 Si 13 O 36 •12H 2 O. It forms as white, green to reddish tabular monoclinic tectosilicate crystals with a Mohs hardness of 3.5 to 4 and a specific gravity of 2.1 to 2.2.
Natrolite is a tectosilicate mineral species belonging to the zeolite group. It is a hydrated sodium and aluminium silicate with the formula Na 2 Al 2 Si 3 O 10 ·2H 2 O. [4] The type locality is Hohentwiel, Hegau, Germany. [3] It was named natrolite by Martin Heinrich Klaproth in 1803. [3]
Mordenite is a zeolite mineral with the chemical formula, (Ca, Na 2, K 2)Al 2 Si 10 O 24 ·7H 2 O. and it is one of the six most abundant zeolites and is used commercially. [3] It was first described in 1864 by Henry How. He named it after the small community of Morden, Nova Scotia, Canada, along the Bay of Fundy, where it was first found.
Zeolites are almost always aluminosilicates, ... but there are also examples of activated charcoal and silica gel. [2] [3] [4] ... Approximate chemical formula: ...
Synthetic zeolites have complex structures and examples (with structural formulae) are: Na 12 Al 12 Si 12 O 48 ·27H 2 O, zeolite A (Linde type A sodium form, NaA), used in laundry detergents [4] Na 16 Al 16 Si 32 O 96 ·16H 2 O, Analcime, IUPAC code ANA [4] Na 12 Al 12 Si 12 O 48 ·q H 2 O, Losod [5] Na 384 Al 384 Si 384 O 1536 ·518H 2 O ...
There is a continuous series between stellerite, whose formula can be written as Ca 4 (Si 28 Al 8)O 72 ·28(H 2 O), and stilbite, and another continuous series between stilbite and barrerite, Na 8 (Si 28 Al 8)O 72 ·26(H 2 O). Epistilbite is a distinct zeolite species unrelated to stilbite.
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