Paulingite
Paulingite series, zeolite / From Wikipedia, the free encyclopedia
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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 | |
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General | |
Category | Zeolite Group |
Formula (repeating unit) | (K,Na,Ca) 3–4(Si,Al) 21O 42•17-22H 2O |
IMA symbol | Pau[1] |
Strunz classification | 9.GC.35 |
Crystal system | Cubic |
Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
Space group | Im3m |
Identification | |
Color | Colorless, light yellow, orange, red |
Crystal habit | Typically as euhedral crystals |
Cleavage | None |
Fracture | Conchoidal |
Mohs scale hardness | 5 |
Luster | Vitreous to adamantine |
Diaphaneity | Transparent |
Specific gravity | 2.085 – 2.24 |
Refractive index | n = 1.472–1.484 |
Ultraviolet fluorescence | None |
References | [2][3][4][5] |
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.[4]
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 nanometers and an isometric crystal system. This is the largest known inorganic unit cell apart from protein structures.[citation needed] Paulingite's characteristic 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).
This section may be confusing or unclear to readers. In particular, highly technical, grammatically erratic. (December 2018) |