THE CRYSTAL CHEMISTRY OF SILICATE MINERALS WITH CHAINS OF (TiO6) OCTAHEDRA

2004 ◽  
Vol 42 (3) ◽  
pp. 807-824 ◽  
Author(s):  
E. Sokolova ◽  
F. C. Hawthorne
Keyword(s):  
Crystal Chemistry ◽  
Silicate Minerals ◽  
Tio6 Octahedra

Crystal chemistry of silicate minerals of geophysical interest

1976 ◽  
Vol 14 (1) ◽  
pp. 37 ◽  
Author(s):  
J. J. Papike ◽  
Maryellen Cameron
Keyword(s):  
Crystal Chemistry ◽  
Silicate Minerals

Electron energy-loss near-edge structure in silicate minerals

1992 ◽  
Vol 50 (2) ◽  
pp. 1258-1259
Author(s):  
D W McComb ◽  
R S Payne ◽  
P L Hansen ◽  
R Brydson
Keyword(s):  
Solid State ◽  
Energy Loss ◽  
Electron Energy ◽  
State Energy ◽  
Local Environment ◽  
Edge Structure ◽  
Silicate Minerals ◽  
Two Samples ◽  
Electron Energy Loss ◽  
Careful Processing

Electron energy-loss near-edge structure (ELNES) is an effective probe of the local geometrical and electronic environment around particular atomic species in the solid state. Energy-loss spectra from several silicate minerals were mostly acquired using a VG HB501 STEM fitted with a parallel detector. Typically a collection angle of ≈8mrad was used, and an energy resolution of ≈0.5eV was achieved.Other authors have indicated that the ELNES of the Si L2,3-edge in α-quartz is dominated by the local environment of the silicon atom i.e. the SiO4 tetrahedron. On this basis, and from results on other minerals, the concept of a coordination fingerprint for certain atoms in minerals has been proposed. The concept is useful in some cases, illustrated here using results from a study of the Al2SiO5 polymorphs (Fig.l). The Al L2,3-edge of kyanite, which contains only 6-coordinate Al, is easily distinguished from andalusite (5- & 6-coordinate Al) and sillimanite (4- & 6-coordinate Al). At the Al K-edge even the latter two samples exhibit differences; with careful processing, the fingerprint for 4-, 5- and 6-coordinate aluminium may be obtained.

Crystal chemistry and stability relations in the system MgCO3–NiCO3*

1971 ◽  
Vol 133 (133) ◽  
pp. 432-444 ◽  
Author(s):  
Alan M. Gaines ◽  
Julian R. Goldsmith
Keyword(s):  
Crystal Chemistry
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