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Title of Journal: Miner Petrol

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Abbravation: Mineralogy and Petrology

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Springer Vienna

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DOI

10.1007/s11009-009-9142-6

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1438-1168

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Cervelleite AgSubscript4/SubscriptTeS soluti

Authors: L Bindi C J Stanley P G Spry
Publish Date: 2015/04/18
Volume: 109, Issue: 4, Pages: 413-419
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Abstract

Examination of the type specimen of cervelleite throws new light on its structure demonstrating how earlier researchers erred in describing the mineral as cubic It was found to be monoclinic space group P21/n with a = 426964 b = 697615 c = 804237 Å β = 1003326° V = 235663 Å3 Z = 4 The crystal structure R1 = 00329 for 956 reflections with I  2σI is topologically identical to that of acanthite Ag2S and aguilarite Ag4SeS It can be described as a bodycentered array of tetrahedrally coordinated X atoms where X = S and Te with Ag2X4 polyhedra in planes nearly parallel to 010 the sheets are linked by the other silver position ie Ag1 that exhibits a threefold coordination Crystalchemical features are discussed in relation to other copper and silver sulfides/tellurides and pure metals A SEM study of the cervelleite crystal used for the structural investigation showed that it is intergrown with an unnamed Ag2FeS2 phase in the type materialMike Rumsey is thanked for providing us with the holotype sample of cervelleite The paper benefited by the official reviews made by Panagiotis Voudouris and an anonymous reviewer Associate Editor Anton Beran is thanked for his efficient handling of the manuscript This work was supported by “Progetto d’Ateneo 2012 University of Firenze” to LB


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