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Paulingite
Paulingite or paulingite-K is a rare zeolite mineral that is found in vesicles in the basaltic rocks from the Columbia River near Rock Island Dam, Washington.
Paulingite was named for Linus Carl Pauling (1901–1994), professor of chemistry, California Institute of Technology and accepted by the International Mineralogical Association in 1960.〔
The early formation in the crystallization sequence and the high water content suggest that paulingite forms from relatively dilute pore fluids. They have a large unit cell of 3.51 nanometres and an isometric crystal system and it is largest known inorganic unit cell apart from protein structures. The paulingite structure can be observed while the remaining water content decomposes. A single crystal X-ray refinement of this chemically different sample material derived three main cation positions, which are inside a so-called paulingite or Calcium (Ca), between 8-rings of neighbouring Barium (Ba), and in the centre of the non-planar 8-rings of the -cage Potassium (K).
==Introduction==
Kamb and Oke in 1960 first described paulingite from vesicles in the Tertiary, augite-bearing-basaltic rocks at the Rock Island dam in Washington, where it is associated with clinoptilolite (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O), phillipsite (Ca,Na2,K2)3Al6Si10O32•12H2O, calcite (CaCO3), and pyrite (FeS2). Zeolite minerals are crystalline, hydrated aluminosilicate of alkali and alkaline cations with a three-dimensional structure. It is a special group of minerals that is important use to different industries. Due to its special properties like attractive adsorption, cation-exchange, dehydration-rehydration and catalysis properties they are used in the nuclear industry, construction industry, agricultural industry, medical industry, petrochemical industry, space industry and domestic products industry (Fredrick A. Mumpton, 1998). It is a rare zeolite mineral with a dodecahedron crystal form and has a very large unit cell with a= 3.51 nanometres. The mineral information was described by Kamb and Oke (1960) which has Si/Al ratio of 3.0, a BaO range of 0.5-.4.1% and 18.5% of water content (Tscherinch and Wise, 1982).
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