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Al2SiO

In aluminosilicates, too, including epidote and the Al2SiOs polymorphs andalusite, kyanite and sillimanite, Al3+ ions occupy several coordination sites. Again, trivalent cations such as Cr3+, V3+, Mn3+ and Fe3+ may show cation ordering and be relatively enriched in one specific Al3+ site in a crystal structure. [Pg.250]

Winter, J. K. Ghose, S. (1979) Thermal expansion and high-temperature crystal chemistry of the Al2SiOs polymorphs. Amer. Mineral., 64,573-86. [Pg.521]

Kerrick D. M. (1990) The Al2SiOs Polymorphs. Reviews in Mineralogy, 22 Mineralogical Society of America. [Pg.1488]

Aluminum silicate, andalusite (Al2SiO ) Aluminum silicate, kyanite (Al2SiOg) Aluminum silicate, sillimanite (Al2SiOg) Aluninum sulfide (AI2S3)... [Pg.42]

The compound Al2Si05 exists in three polymorphic forms, cyanite, sillimanite, and andalusite. In each of the three forms of Al2SiOs one-half of the A1 atoms are 6-coordinated and the other half are in positions of 4-, 5-, and 6-coordination in sillimanite, andalusite, and cyanite respectively. The latter is accordingly the most compact of the three forms, the oxygen atoms being cubic close-packed. Just as the... [Pg.812]

X-Ray powder data and i.r. spectra have been reported for the kyanite phases Al2SiOs and AljGeOj, synthesized at 20kbar and 1000 °C."""... [Pg.122]

Shock compression experiments on the andalusite phase of Al2SiOs show that disproportionation to AI2O3 and Si02 occurs at pressures in excess of 585 kbar."" ... [Pg.122]

Use the additivity rule to estimate (a) the polarisability and (b) the volume polarisability of mullite, Al2SiOs. The following volume polarisabilities were found in the literature Si02, 4.84 x 10 °m AI2O3, 7.70 X 10 m. The experimental value is... [Pg.361]

Also known as bauxitland cement. Kurlbaum Method. A method for the determination of flame temperature by means of an optical pyrometer (F. Kurlbaum, Phys. Z., 3,187,1902). Kyanite. A mineral having the same composition (Al2SiOs) as sillimanite and andalusite, but with different physical properties. The chief sources are Virginia and S Carolina (USA), and India. When fired, kyanite breaks down at 1300°C into mullite and cristobalite with a volume expansion of about 10% it is therefore calcined before use. Calcined kyanite is used in making aluminous refractories. [Pg.179]

See other pages where Al2SiO is mentioned: [Pg.11]    [Pg.11]    [Pg.11]    [Pg.19]    [Pg.226]    [Pg.539]    [Pg.255]    [Pg.255]    [Pg.255]    [Pg.154]    [Pg.264]    [Pg.264]    [Pg.295]    [Pg.1038]    [Pg.565]    [Pg.631]    [Pg.337]    [Pg.44]    [Pg.298]    [Pg.111]    [Pg.395]    [Pg.311]    [Pg.111]    [Pg.39]    [Pg.375]    [Pg.375]    [Pg.375]    [Pg.373]    [Pg.373]    [Pg.373]    [Pg.7]   
See also in sourсe #XX -- [ Pg.5 , Pg.247 , Pg.250 , Pg.251 ]

See also in sourсe #XX -- [ Pg.5 , Pg.77 , Pg.84 ]

See also in sourсe #XX -- [ Pg.5 , Pg.77 , Pg.84 ]

See also in sourсe #XX -- [ Pg.2 , Pg.4 , Pg.5 , Pg.39 ]



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Andalusite, Al2SiO

Kyanite, Al2SiO

Sillimanite, Al2SiO

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