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GEOREF RECORD

Infrared study of aragonite and calcite

Hans H. Adler and Paul F. Kerr
Infrared study of aragonite and calcite
American Mineralogist (1962) 47: 700-717

Abstract

The fundamental vibration spectra of aragonite and calcite in the 2- to 15-mu region of the infrared have been described in previous investigations. Recently run curves, however, cast doubt on the assignment of absorption bands in the 11- to 12-mu range. Investigation of the spectra of some 20 mineral specimens indicates that the band at 11.65mu is specific for aragonite whereas the band at 11.41mu is caused by calcite. Five of the specimens studied yield spectra with both bands, suggesting that natural aggregation of the 2 minerals is a rather common occurrence. In artificial mixtures, the intensity ratio of the bands at 11.41 and 11.65mu is found to be approximately proportional to the ratio of concentration of aragonite and calcite in a given sample. However, considering the range in absorption intensity inherent in different specimens, the method as now applied yields at best semiquantitative data accurate to within 10% (absolute) of the mineral content in the specimen. Spectrograms obtained on recent and fossil invertebrates suggest application of the method to the study of the composition of calcareous shells.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 47
Title: Infrared study of aragonite and calcite
Pages: 700-717
Published: 1962
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
Accession Number: 1962-010392
Categories: Geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus., tables
Source Note: nos. 5-6
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1962
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