Fachbereich 14 - Geowissenschaften
Institut für Mineralogie
Emmy-Noether (DFG) Nachwuchsprogramme

Crystal chemical examinations of complex mineral structures

Crystal chemical examinations of complex mineral structures. These crystal structures may be divided into two parts (1) the structural unit, an array of high bond-valence polyhedra and (2) the interstitial complex, an array of large low valence cations, simple anions and (H₂O) groups. Our examinations have been focused on (a) the topology of these complex structures, i.e. the three-dimensional arrangement of the structural units; (b) the interaction between structural units and interstitial complexes, i.e. how does the structural unit determine the chemical composition of an interstitial complex; (c) occurrence of structural units under different geochemical conditions (pH/Eh), (d) crystal growth and dissolution mechanisms of environmental relevant uranium minerals with different structural units and in solutions with different pH, composition and supersaturation.

Drittmittelgeber:

Deutsche Forschungsgemeinschaft

Beteiligte Wissenschaftler:

Dr. Michael Schindler, Petre Mandeliev, Andreas Mutter

Veröffentlichungen:

Hughes, J.M., Schindler, M., Ravokan, J. and Cureton, F. (2002): The crystal structure of huemmerite, KMg(V5O14).8H2O: Bonding between the [V10O28]6- structural unit and the {K2Mg2(H2O)16}6+ interstitial complex. Can. Mineral. 40, 1429-1435.

Hawthorne, F. C., Schindler, M., Grice, J. D. and Haynes, P. (2001): Orthominasragrite, V4+O(SO4)(H2O)5, a new mineral species from Temple Mountain, Emery county, Utah, U.S.A. Can. Mineral. 39, 1325-1332.

Schindler, M. and Hawthorne, F. C. (2001a): A bond-valence approach to the structure, chemistry and paragenesis of hydroxy-hydrated oxysalt minerals: III. Paragenesis of borate minerals. Can. Mineral. 39, 1257-1274.

Schindler, M. and Hawthorne, F. C. (2001b): A bond-valence approach to the structure, chemistry and paragenesis of hydroxy-hydrated oxysalt minerals: II. Crystal structure and chemical composition of borate minerals. Can. Mineral. 39, 1243-1256.

Schindler, M. and Hawthorne, F. C. (2001c): A bond-valence approach to the structure, chemistry and paragenesis of hydroxy-hydrated oxysalt minerals: I. Theory. Can. Mineral. Can. Mineral. 39, 1225-1242.