Summary
The crystal structure of Hiortdahlite II [triclinic P1,a = 11.012(6),b = 10.342(3),c = 7.359 (3) Å,a = 89.92(2)°, β = 109.21(5)°,y = 90.06(3)°], was determined and refined using 1793 reflections toR 1 = 0.069 and R2 = 0.066. The results of the structural study indicated that hiortdahlite II presents the modules which characterize the whole family of minerals related to cuspidine and låvenite, namely “octahedral walls”, four columns large and running alongc, and Si2O7 groups. In hiortdahlite II the modules are connected according to the same topology realized in låvenite. The peculiar octahedral cations distribution, which is determined and discussed in this work, is responsible for the descent in symmetry to P1.[▭
Zusammenfassung
Die Kristallstruktur des Hjortdahlits II [triklin P1,a = 11,012(6),b = 10,342(3),c = 7,359(3)Å, a = 89,92(2), β = 109,21 (5),y= 90,06(3)°] wurde mit 1793 Reflexen bestimmt und aufR 1 = 0,069 bzw.R 2 = 0,066 verfeinert. Das Ergebnis der Strukturuntersuchung zeigt, daß der Hjortdahlit II jene Baueinheiten enthält, welche die ganze mit Cuspidin und Låvenit verwandte Mineralgruppe auszeichnen: äoktaederwände", die vier Reihen breit sind und längsc verlaufen, sowie Si2O7-Gruppen. In Hjortdahlit II sind die Baueinheiten nach derselben Topologie wie in Låvenit verknüpft. Die besondere Verteilung der oktaedrisch koordinierten Kationen, die in der Arbeit bestimmt und diskutiert wird, ist für die Symmetrieerniedrigung nach P 1 verantwortlich.[▭
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Publication was delayed to await IMA-CNMMN decision on new name; the latter was accepted in December, 1986.
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Merlino, S., Perchiazzi, N. The crystal structure of Hiortdahlite II. Mineralogy and Petrology 37, 25–35 (1987). https://doi.org/10.1007/BF01163156
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DOI: https://doi.org/10.1007/BF01163156