Nickenichite, a new arsenate from the Eifel, Germany (original) (raw)

Summary

Nickenichite is a new mineral found close to the village of Nickenich at the Nickenicher Sattel, Eifel, Germany. The chemical composition is NaxCayCuz(Mg, Fe, Al)3(AsO4)3, x ≈ 0.8, y ≈ 0.4, ≈ 0.4 and was derived by means of electron microprobe analyses and by a crystal structure investigation. The latter was determined from single-crystal X-ray data:a = 11.882(4)Å,b = 12.760(4)Å,c = 6.647(2)Å,β = 112.81(2)°, space group C2/c,Z = 4;R = 0.053 and_R_ w = 0.033 from 984 observed data and 102 free variables. Nickenichite is structurally related to the minerals o'danielite and johillerite. The two crystallographically different octahedrally coordinated cation positions_Me_ = (Mg, Fe, Al) have average_Me_-O distances of 2.108 Å and 2.056 Å, octahedra share edges to form zig-zag chains in\([10\bar 1]\); the chains are interconnected by AsO4 tetrahedra. In addition the compound is characterized by partially occupied Na[4+4], Ca[6+2] and Cu[4] positions.

Zusammenfassung

Nickenichit ist ein neues Mineral, das nahe dem Ort Nickenich, am Nickenicher Sattel, Eifel, Deutschland, gefunden wurde. Die chemische Formel ist NaxCayCuz, (Mg, Fe, Al)3(AsO4)3, x ≈ 0,8, y ≈ 0,4, z ≈ 0,4 und wurde mittels Elektronenstrahl-Mikrosondenanalysen und einer Kristallstrukturuntersuchung ermittelt. Letztere wurde mit Einkristall-Röntgendaten durchgeführt:a = 11,882(4) Å,b = 12,760(4) Å,c = 6,647(2) Å,β = 112,81(2)°, Raumgruppe C2/c,Z = 4;R = 0,053 und_R_ w = 0,033 für 984 beobachtete Daten und 102 freie Variable. Nickenichit zeigt enge strukturelle Beziehungen zu den Mineralen O'Danielit und Johillerit. Die zwei kristallographisch verschiedenen oktaedrisch koordinierten Kationpositionen_Me_ = (Mg, Fe, Al) haben mittlere_Me_-O-Abstände von 2,108 Å und 2,056 Å, die Oktaeder werden über Kanten zu zick-zack-artigen Ketten in\([10\bar 1]\) verknüpft, diese werden untereinander über AsO4-Tetraeder vernetzt. Des weiteren ist die Verbindung durch partiell besetzte Na[4+4]-, Ca[6+2]- und Cu[4]-Positionen charakterisiert.

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Authors and Affiliations

1. Institut für Mineralogie und Kristallographie der Universität Wien, Dr. Karl Lueger Ring, 1, A-1010, Wien, Austria
   M. Auernhammer, H. Effenberger & E. Tillmanns
2. Schillerstrasse 1, D-53489, Sinzig, Germany
   G. Hentschel
3. Institut für Mineralogie, Ruhr-Universität Bochum, Postfach 102148, D-44780, Bochum, Germany
   Th. Reinecke

Authors

1. M. Auernhammer
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2. H. Effenberger
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3. G. Hentschel
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4. Th. Reinecke
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5. E. Tillmanns
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Auernhammer, M., Effenberger, H., Hentschel, G. et al. Nickenichite, a new arsenate from the Eifel, Germany.Mineralogy and Petrology 48, 153–166 (1993). https://doi.org/10.1007/BF01163094

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• Received: 30 October 1992
• Accepted: 10 March 1993
• Issue Date: June 1993
• DOI: https://doi.org/10.1007/BF01163094

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