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HRTEM characterization of scapolite solid solutions

Ishmael Hassan and Peter R. Buseck
HRTEM characterization of scapolite solid solutions
American Mineralogist (February 1988) 73 (1-2): 119-134

Abstract

Scapolite composition varies between that of the end-members marialite Na (sub 4) (Al (sub 3) Si (sub 9) O (sub 24) )Cl and meionite Ca (sub 4) (Al (sub 6) Si (sub 6) O (sub 24) )CO (sub 3) . Two binary solid-solution series exist between the end-members: series (a) between 0 and 75% meionite is formed by a coupled replacement (Na (sub 4) .Cl)Si (sub 2) reverse= (NaCa (sub 3) .CO (sub 3) )Al (sub 2) , and series (b) between 75 and 100% meionite is formed by a coupled-replacement (NaCa (sub 3) .CO (sub 3) )Si reverse= (Ca (sub 4) .CO (sub 3) )Al. These reactions behave independently. High-resolution TEM indicates that series (a) scapolites belong to space group P4 or P4/m, the result of ordering of the clusters (in the square brackets) and that series (b) scapolites belong to space group I4/m, the result of disordered clusters. The ordering of the clusters in series (a) gives rise to antiphase domains; such domains are not observable in series (b).


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 73
Serial Issue: 1-2
Title: HRTEM characterization of scapolite solid solutions
Affiliation: Ariz. State Univ., Dep. Geol., Tempe, AZ, United States
Pages: 119-134
Published: 198802
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 40
Accession Number: 1988-027963
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1988
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