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Mineralogical ClassificationCrystal chemistry of tyrolite
1st Aug 2006 20:39 UTCMarco E. Ciriotti Manager
• Krivovichev, S.V., Chernysov, D.Yu., Döbelin, N., Armbruster, Th., Kahlenberg, V., Kaindl, R., Ferraris, G., Tessadri, R., Kaltenhauser, G. (2006): Crystal chemistry and polytypism of tyrolite. American Mineralogist, 91, 1378-1384.
Abstract:
The crystal structures of the 1M and 2M polytypes of tyrolite have been solved from single-crystal X-ray diffraction data. The structure of tyrolite-1M has been refined to R1 = 0.086 on the basis of 2522 unique observed reflections collected using synchrotron radiation at the Swiss-Norwegian beamline BM01 of the European Synchrotron Research Facility (SNBL at the ESRF). The structure of tyrolite-2M has been refined to R1 = 0.144 on the basis of 2666 unique observed reflections obtained from a non-merohedrally twinned crystal using in-house X-ray radiation and a STOE IPDS II imageplate diffractometer. The structures are based upon complex nanolayers consisting of Cu, As, and Ca coordination polyhedra. The core of the nanolayer is a copper arsenate substructure consisting of A and B sublayers. The B sublayer consists of chains of edge-sharing Cu octahedra running along the b axis. The A sublayer contains trimeric units of Cu octahedra sharing corners with AsO4 tetrahedra. Two adjacent A sublayers are linked by the octahedral chains of the B sublayer resulting in formation of the 18 Ã… thick ABA slab. The ABA slab is sandwiched between sublayers of Ca2+ cations and H2O molecules. Adjacent nanolayers are connected by hydrogen bonds to the interlayer species (carbonate anions and H2O molecules). The structures of tyrolite-1M and tyrolite-2M differ by the stacking sequence of the nanolayers only. The adjacent nanolayers in tyrolite-2M are shifted by b/2 = 2.8 Ã… in comparison to the relative position of the nanolayers in tyrolite-1M. The structural formula of tyrolite can be written as (H2O)x where x = 0-1.
4th Aug 2006 10:38 UTCUwe Kolitsch Manager
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