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Encyclopedia > Ferrierite

The ferrierite group of zeolite minerals consists of three very similar varieties: ferrierite-Mg, ferrierite-Na, and ferrierite-K, based on the dominant cation. Ferrierites are orthorhombic minerals with highly variable cationic composition, (Na,K)2Mg(Si,Al)18O36(OH)·9H2O. Calcium and other ions are often also present. They are found in vitreous to pearly, often radiating, spherical aggregates of thin blade-shaped transparent to translucent crystals. Zeolite Zeolites (Greek, zein,to boil;lithos,a stone) are minerals that have a porous structure. ... Minerals are natural compounds formed through geological processes. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... General Name, Symbol, Number sodium, Na, 11 Series alkali metal Group, Period, Block 1 (IA), 3, s Density, Hardness 968 kg/m3, 0. ... General Name, Symbol, Number potassium, K, 19 Series alkali metals Group, Period, Block 1(IA), 4, s Density, Hardness 856 kg/m3, 0. ... A cation is an ion with positive charge. ... In crystallography, the orthorhombic crystal system is one of the 7 lattice point groups. ...


Ferrierite typically occurs as an alteration mineral in basaltic rocks and in tuffaceous sediments. In North America, they come from Kamloops Lake, BC, Canada and Leavitt Lake, California. Ferrierite was named for Canadian geologist and mining engineer Walter Frederick Ferrier (1865-1950). Basalt Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense. ... Welded tuff at Golden Gate in Yellowstone National Park Tuff (from the Italian tufo and pronounced toof) is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. ... Kamloops Lake is situated on the Thompson River just west of Kamloops. ...


Synthetic ferrierites have even greater cation variability and have important uses as commercial filters and ion-exchange beds.


References


  Results from FactBites:
 
Patent 4088739: Process for preparing synthetic ferrierite (2372 words)
The preferred method of preparing the lithium-promoted ferrierite precursor reactant mixtures is to mix a source of Group I and/or Group II cations, such as the hydroxides thereof, with a source of alumina, a source of silica, water, lithium cations and natural or synthetic ferrierite as seeds.
For example, the lithium magnesium ferrierite reaction mixture is prepared by mixing lithium hydroxide, magnesium hydroxide, a source of alumina, a source of silica, water, and natural or synthetic ferrierite seeds.
The seeds are present in concentration of 0.1 to 10 percent of the reaction mixture of a powdered or natural ferrierite, or a powdered synthetic ferrierite recovered from previous reactions.
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