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The 14 A (super o) phase developed in heated dickites

G. W. Brindley and H. M. Wan
The 14 A (super o) phase developed in heated dickites
Clay Minerals (March 1978) 13 (1): 17-24


Dickites with well-ordered crystal structures and with relatively high dehydroxylation temperatures develop a 14 Aa phase when heated to temperatures in the range 550-800 degrees C. The actual spacing is close to 13.7-13.8 Aa. Dickites with less well-ordered structures and with lower dehydration temperatures give less development of this phase or none at all. Other kaolinite group minerals do not produce a similar phase. Thermal weight-change and differential thermal analysis data show that the 14 Aa phase develops to a maximum as hydroxyl ions are eliminated from the dickite structure and infrared spectroscopic data are consistent with this result. AIKalpha fluorescence wavelength measurements indicate that the Al ions are in four-fold coordination in the 14 Aa phase. Absence of other diffraction data makes structure analysis impossible. The description 'chlorite-like' for the 14 Aa phase is of questionable validity.

ISSN: 0009-8558
Serial Title: Clay Minerals
Serial Volume: 13
Serial Issue: 1
Title: The 14 A (super o) phase developed in heated dickites
Affiliation: Pa. State Univ., Dep. Geosci., University Park, Pa., United States
Pages: 17-24
Published: 197803
Text Language: English
Summary Language: French
Summary Language: German
Summary Language: Spanish
Publisher: Mineralogical Society, London, United Kingdom
References: 18
Accession Number: 1978-030203
Categories: Mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. table
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 1978
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