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Faujasite
General
Category
Zeolite
Formula (repeating unit)
(Na2,Ca,Mg)3.5[Al7Si17O48]·32(H2O)[1]
IMA symbol
Fau[2]
Strunz classification
9.GD.30
Crystal system
Cubic
Crystal class
Hexoctahedral (m3m) H–M Symbol (4/m 3 2/m)
Space group
Fd3m
Unit cell
a = 24.638–24.65 Å, Z = 32
Identification
Color
Colorless, white
Crystal habit
Octahedral or rarely trisoctahedral crystals up to 4 mm in size
Twinning
on {111}, contact and penetration twins
Cleavage
{111}, perfect
Fracture
Uneven to conchoidal
Tenacity
Brittle
Mohs scale hardness
4.5-5
Luster
Vitreous to adamantine
Streak
White
Diaphaneity
Transparent
Specific gravity
1.92–1.93
Optical properties
Isotropic
Refractive index
n = 1.466–1.480
Pleochroism
None
References
[3][4][5]
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 (Na2,Ca,Mg)3.5[Al7Si17O48]·32(H2O) by varying the amounts of sodium, magnesium and calcium.[1] Faujasite occurs as a rare mineral in several locations worldwide.
Faujasite materials are widely synthesized industrially. The relatively low-silica (Si/Al<2) synthetic faujasite is called Zeolite X and the high-silica (Si/Al>2) one is called Zeolite Y. In addition, the aluminum component in zeolite Y can be removed by acid-treatment and/or steam-treatment, and the resulting faujasite is called USY (Ultrastable zeolite Y). USY is used in fluid catalytic cracking process as a catalyst.
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...
Tatarstan, a place in Russia Ultrastable zeolite Y, high-silica synthesized faujasite that had its aluminium removed Usie, a term for group selfies United States...
gaseous ionic exchange unlike the naturally occurring faujasites: faujasite-Ca, faujasite-Mg, and faujasite-Na. The exchanged copper atom can vary in oxidation...
component and can comprise from about 15% to 50%, by weight, of the catalyst. Faujasite (aka Type Y) is the zeolite used in FCC units. The zeolites are strong...
to meet the requirements for industrial use. In particular, the FAU (faujasite, USY), *BEA (beta), MOR (high-silica mordenite), MFI (ZSM-5), and FER...
Material Application 7140 Metal–organic framework gas absorption 900 Faujasite catalyst 500–3000 activated carbon gas and solute absorption 200 alumina...
on a computer keyboard Zeolite F-9, a sodium-type molecular sieve with faujasite framework structure, also known as 13X 9F (disambiguation) Fix (disambiguation)...
octahedron occurs as the sodalite cage structure in the framework of faujasite crystals. In solid-state physics, the 1st Brillouin zone of the face-centered...
The change in the coordination increases the ionicity of the Si–O bond. Faujasite silica, another polymorph, is obtained by the dealumination of a low-sodium...
Pines, A (1998). "A high-resolution(17)O NMR study of siliceous zeolite faujasite". Journal of the American Chemical Society. 120 (14): 3510–3511. doi:10...
Attfield, Martin P. (1998). "Strong negative thermal expansion in siliceous faujasite". Chemical Communications (5): 601–602. doi:10.1039/A707141H. Bullis,...
Force (Spanish: Fuerza Aérea Uruguaya) Automobile Federation of Ukraine Faujasite, a zeolite material Big Fau, a fictional "Megadeus" robot in The Big O...
Also, he is credited with the discovery of numerous new mineral species; faujasite, bertrandite, jacobsite and alluaudite, to name a few. In 1854 he named...
channels defined by 30-membered rings (the naturally occurring zeolite faujasite with channels defined by 12-membered rings). Zeolites with frameworks...
of solid acids such as amorphous silica-alumina, ZSM-5, or synthetic faujasite relies on an understanding of the chemical site of acidity. Gorte has...
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