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Science 14 September 1962:
Vol. 137. no. 3533, pp. 853 - 854
DOI: 10.1126/science.137.3533.853
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Articles

Unit-Cell Dimensions of Natural and Synthetic Scapolites

Hans P. Eugster 1, Harold J. Prostka 2, and Daniel E. Appleman 3

1 Department of Geology, Johns Hopkins University, and U. S. Geological Survey, Baltimore, Maryland
2 Department of Geology, Johns Hopkins University, Baltimore 18, Maryland
3 U. S. Geological Survey, Washington 25, D.C.

In natural scapolites the cell dimension a shows a regular increase from marialite to meionite composition, while c remains constant. Both a and c of synthetic meionite are larger than the corresponding dimensions of synthetic marialite. The cell volume of both natural and synthetic scapolites is a nearly linear function of composition. Variations in cell dimensions of scapolites may be caused by differences in structural state similar to those in plagioclase feldspars.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)