Conjugate Cummingtonite and Hornblende at Sgeir Nan Sgarbh, South Harris, Outer Hebrides

A. Livingstone, M. T. Frost and P. Suddaby
Department of Geology, Royal Scottish Museum, Edinburgh
Department of Geology, Imperial College of Science and Technology, London, SW7

Summary: Chemical analyses, cell parameters, and optical data are presented for conjugate cummingtonite and hornblende, which occur in a paragneiss. A metasomatic origin for the development of hornblende from cummingtonite, during retrogressive metamorphism, is proposed.

Mineralogical Magazine; December 1973 v. 39; no. 304; p. 464-466; DOI: 10.1180/minmag.1973.039.304.09
© 1973, The Mineralogical Society
Mineralogical Society (