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Specific surface area and ultramicroporosity in polymorphs of silica

Maria Angeles Bustillo, Rafael Fort and Manuel Bustillo
Specific surface area and ultramicroporosity in polymorphs of silica
European Journal of Mineralogy (December 1993) 5 (6): 1195-1204


A detailed study of the specific surface area (SSA) and the volume of pores between 10 and 400 Angstrom (ultramicroporosity or UMP) in different types of silica phases from different localities and geological settings is reported. It was found that small proportions of other minerals in the siliceous rocks can alter the SSA and UMP substantially. Opal-A (diatomite) has SSA 23.87 m (super 2) /g and UMP 9.90%; opal-CT has 7.76-14.05 m (super 2) /g and 6.68- 8.50%; alpha -cristobalite has 1.93-2.43 m (super 2) /g and 1.27- 1.52%; alpha -tridymite has 1.93-2.56 m (super 2) /g and 1.05-1.62%. There is a loss of SSA and UMP in the diagenetic transformation opal-A right arrow opal-CT right arrow opal-C (alpha - cristobalite). The host rock in which the silica phase is formed may play an important role in the SSA: e.g. opal-CT formed in a sepiolite rock has a greater SSA than opal-CT formed in a limestone. The UMP is characteristic of the silica phase, though in opal-CT this may vary in relation to the texture.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 5
Serial Issue: 6
Title: Specific surface area and ultramicroporosity in polymorphs of silica
Affiliation: Dpto. Geologia, Museo de Ciencias Naturales, C.S.I.C., Madrid, Spain
Pages: 1195-1204
Published: 199312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 24
Accession Number: 1994-001554
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 tables
Secondary Affiliation: Univ. Compultense, ESP, Spain
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199401
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