Sodium at the A site in clinoamphiboles: The effects of composition on patterns of order

Canadian Mineralogist

Volumn 34, Issue 3, 1996, Pages 577-593

  Hawthorne, Frank C ^a,b   Oberti, Roberta ^a   Sardone, Nicola ^a  

^a CNR   (Italy)

^b UNIVERSITY OF MANITOBA   (Canada)

Author keywords

Amphibole; Electron density; Na ordering; Short range order; Structure refinement

Indexed keywords

AMPHIBOLE; CRYSTAL CHEMISTRY; CRYSTAL STRUCTURE; ELECTRON DENSITY; ORDERING; SODIUM;

EID: 0030302353     PISSN: 00084476     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (23)

1. BOCCHIO, R., UNGARETTI, L. & ROSSI, G. (1978): Crystal chemical study of eclogitic amphiboles from Alpe Arami, Lepontine Alps, southern Switzerland. Soc. Ital. Mineral. Petrol. Rend. 24, 453-470.
2. BOSCHMANN, K.F., BURNS, P.C., HAWTHORNE, F.C., RAUDSEPP, M. & TURNOCK, A.C. (1994): A-site disorder in synthetic fluor-edenite, a crystal structure study. Can. Mineral. 32, 21-30.
3. BROWN, I.D. (1981): The bond-valence method: an empirical approach to chemical structure and bonding. In Structure and Bonding in Crystals II (M. O'Keeffe & A. Navrotsky, eds.). Academic Press, New York (1-30).
4. CAMERON, M. & GIBBS, G.V. (1971): Refinement of the crystal structure of two synthetic fluor-richterites. Carnegie Inst. Wash., Year Book 70, 150-153.
5. _, SUENO, S., PAPIKE, J.J. & PREWITT, C.T. (1983): High temperature crystal-chemistry of K and Na fluorrichterites. Am. Mineral. 68, 924-943.
6. GIBBS, G.V. (1966) Untitled article. In AGI Short Course Lecture Notes on Chain Silicates, 1-23.
7. _ & PREWITT, C.T. (1968): Amphibole cation site disorder. In Int. Mineral. Assoc., Pap. Proc. Fifth Gen. Meet. (Cambridge, 1966). Mineralogical Society, London, U.K. (abstr.).
8. HAWTHORNE, F.C. (1983): The crystal chemistry of the amphiboles. Can. Mineral. 21, 173-480.
9. _ & GRUNDY, H.D. (1972): Positional disorder in the A-site of clino-amphiboles. Nature (Phys. Sci.) 235, 72-73.
10. _ & _ (1973a): The crystal chemistry of the amphiboles. I. Refinement of the crystal structure of ferrotschermakite. Mineral. Mag. 39, 36-48.
11. _ & _ (1973b): The crystal chemistry of the amphiboles. II. Refinement of the crystal structure of oxykaersutite. Mineral. Mag. 39, 390-400.
12. _ & _ (1978): The crystal chemistry of the amphiboles. VII. The crystal structure and site chemistry of potassian ferri-taramite. Can. Mineral. 16, 53-62.
13. _, GRIEP, J.L. & CURTIS, L. (1980): A three-amphibole assemblage from the Tallan Lake sill, Peterborough County, Ontario. Can. Mineral. 18, 275-284.
14. _, UNGARETTI, L., OBERTI, R., BOTTAZZI, P. & CZAMANSKE, G.K. (1993): Li: an important component in igneous alkali amphiboles. Am. Mineral. 78, 733-745.
15. HERITSCH, H. (1955): Bemerkungen zur Schreibung der kristallchemischen Formel der Hornblende. Tschermaks Mineral. Petrogr. Mitt. 5, 242-245.
16. [6]A1 disorder in amphiboles from mantle peridotites. Can. Mineral. 33, 867-878.
17. _, SARDONE, N., HAWTHORNE, F.C., RAUDSEPP, M. & TURNOCK, A.C. (1995c): Synthesis and crystal-structure refinement of synthetic fluor-pargasite. Can. Mineral. 33, 25-31.
18. _, UNGARETTI, L., CANNILLO, E. & HAWTHORNE, F.C. (1992): The behaviour of Ti in amphiboles. I. Four- and six-coordinated Ti in richterite. Eur. J. Mineral. 4, 425-439.
19. _, _, _, _ & MEMMI, I. (1995a): Temperature-dependent Al order-disorder in the tetrahedral double-chain of C2/m amphiboles. Eur. J. Mineral. 7, 1049-1063.
20. PAPIKE, J.J., ROSS, M. & CLARK, J.R. (1969): Crystal-chemical characterization of clinoamphiboles based on five new structure refinements. Mineral. Soc. Am., Spec. Pap. 2, 117-136.
21. PREWITT, C.T. (1963): Crystal structures of two synthetic amphiboles. Geol Soc. Am., Spec. Pap. 76, 132-133 (abstr.).
22. UNGARETTI, L. (1980): Recent developments in X-ray single crystal diffractometry applied to the crystal-chemical study of amphiboles. God. Jugoslav. Kristalogr. 15, 29-65.
23. _, SMITH, D.C. & ROSSI, G. (1981): Crystal-chemistry by X-ray structure refinement and electron microprobe analysis of a series of sodic-calcic to alkali-amphiboles from the Nybö eclogite pod, Norway. Bull. Minéral. 104, 400-412.