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Science 24 November 1967:
Vol. 158. no. 3804, pp. 1053 - 1056
DOI: 10.1126/science.158.3804.1053
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Articles

Staurolite: Sectoral Compositional Variations

Lincoln S. Hollister 1 and A. E. Bence 2

1 Department of Geology, University of California, Los Angeles 90024
2 Division of Geological Sciences, California Institute of Technology, Pasadena 91109

Electron-microprobe analyses across six successive sections of a single staurolite crystal show that the staurolite has three crystallographically controlled sectors, each with a distinctive content of Al, Si, Ti, Fe, Mg, and Mn. The sector distribution of elements raises the question of whether the staurolite acts as one or several phases during growth. Total analyses of the separate sectors suggest that: (i) the staurolite has tetrahedral Al substitution for Si, and (ii) the hydroxyl content varies beween sectors.


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