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GEOREF RECORD

Crystal structure and chemistry of lithium-bearing trioctahedral micas-3T

Maria Franca Brigatti, Daniel E. Kile and Luciano Poppi
Crystal structure and chemistry of lithium-bearing trioctahedral micas-3T (in Special issue dedicated to the memory of Luciano Ungaretti, Maria Chiara Domeneghetti (prefacer))
European Journal of Mineralogy (April 2003) 15 (2): 349-355

Abstract

Chemical analyses and crystal structure refinements are reported for lithian siderophyllite-3T crystals from granitic pegmatites of the anorogenic Pikes Peak batholith, Colorado. These micas fall on the siderophyllite-polylithionite join, closer to siderophyllite. Single-crystal XRD refinements in space group P3 (sub 1) 12 (with R 0.034-0.036) on three samples indicate an ordered cation distribution with M1 and M3 positions substantially larger than M2. The tetrahedral cation-oxygen atom mean distances are 1.614-1.638 and 1.663-1.678 Aa for T1 and T2 sites, respectively consistent with Al (super 3+) enrichment in T2. The tetrahedral rotation angle (alpha ) is generally small (3.1-4.6 degrees ) and decreases with siderophyllite content. As Fe increases, the T1 tetrahedron becomes flatter, whereas T2 tetrahedron distortion is unchanged.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 2
Title: Crystal structure and chemistry of lithium-bearing trioctahedral micas-3T
Title: Special issue dedicated to the memory of Luciano Ungaretti
Author(s): Brigatti, Maria FrancaKile, Daniel E.Poppi, Luciano
Author(s): Domeneghetti, Maria Chiaraprefacer
Affiliation: Universita di Modena e Reggio Emilia, Dipartimento di Scienze della Terra, Modena, Italy
Pages: 349-355
Published: 200304
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 33
Accession Number: 2003-032477
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: U. S. Geological Survey, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200311
Program Name: USGSOPNon-USGS publications with USGS authors
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