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Improved powder X-ray data for cancrinites II: Liottite and sacrofanite

Published online by Cambridge University Press:  10 January 2013

Paolo Ballirano ,
Adriana Maras ,
Peter R. Buseck ,
Su Wang  and
Ann M. Yates
Paolo Ballirano
Affiliation:
Dipartimento di Scienze della Terra, Università degli studi di Roma “La Sapienza,”P. le Aldo Moro, 5, Roma, 1-00185, Italy
Adriana Maras
Affiliation:
Dipartimento di Scienze della Terra, Università degli studi di Roma “La Sapienza,”P. le Aldo Moro, 5, Roma, 1-00185, Italy
Peter R. Buseck
Affiliation:
Departments of Geology and Chemistry, Arizona State University, Tempe, Arizona 85287-1404
Su Wang
Affiliation:
Departments of Geology and Chemistry, Arizona State University, Tempe, Arizona 85287-1404
Ann M. Yates
Affiliation:
Departments of Geology and Chemistry, Arizona State University, Tempe, Arizona 85287-1404
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Abstract

Improved powder X-ray diffraction (XRD) data for liottite and sacrofanite, two members of the cancrinite group of minerals, were obtained using a rotating anode diffractometer. The cell parameters of liottite are a = 12.8575(3), c = 16.0905(6) Å, and the space group is ; the strongest reflections are at 4.834(38), 3.783(12), 3.714(100), 3.312(91), 2.784(13), 2.682(26), 2.470(17), and 2.143(27) Å. The cell parameters of sacrofanite are a = 12.8945(4) and c =74.2128(37) Å, and the possible space groups are P63/mmc, P63mc, and ; the strongest reflections are at 11.18(23), 3.757(25), 3.723(100), 3.488(27), 3.302(62), 2.651(31), 2.645(30), and 2.149(18) Å. The new data include an increased number of indexed peaks and empirical formulae that differ from the reference data (PDF 29-1187 and PDF 35-653, respectively).

Type
Research Article
Information
Powder Diffraction , Volume 10 , Issue 1 , March 1995 , pp. 13 - 19
Copyright
Copyright © Cambridge University Press 1995

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