Platy Phlogopite from Blast-Furnace Slags

E. Wearing*
Department of Geology and Mineralogy, Oxford University, Parks Road, Oxford OX1 3PR
*Present address: 210 Wingrove Road, Newcastle upon Tyne, NE4 9DD.

Abstract: Phlogopite mica has crystallized from blast-furnace slags at atmospheric pressure. Its chemistry is characterized by an excess of Na and K over their normal stoichiometric content, which is attributed to a composite association between phlogopite and glass. The diffraction pattern indicates that the phlogopite has a preferred orientation around the a-axis. Scanning electron microscopy shows that this phlogopite consists of numerous small platelets, which probably have their a-axes aligned.

Mineralogical Magazine; March 1984 v. 48; no. 346; p. 81-84; DOI: 10.1180/minmag.1984.048.346.10
© 1984, The Mineralogical Society
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