Two Olivines from South African Melilite-Basalts

Morna Mathias
Geology Department, University of Cape Town

Abstract: Two olivines from the Spiegel river and Klaasvoogds melilite-basalts of the Cape Province are analysed. Optical properties for the olivines are given. These show excellent agreement with the chemical results. The olivines belong to the forsterite-fayalite series and do not contain significant amounts of Ca2SiO4. The presence of nepheline, leucite, analcime, apatite, and zircon in the Klaasvoogds melilite-basalt is described for the first time.

Mineralogical Magazine; March 1949 v. 28; no. 204; p. 486-491; DOI: 10.1180/minmag.1949.028.204.04
© 1949, The Mineralogical Society
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