stripes
There are three plugs of olivine melilitite in this area: Goedemoed, Goedvertrou and Sandvliet (Verwoerd et al., 1990). The Goedemoed plug is located 15 km southeast of Robertson. The rock consists of euhedral olivine phenocrysts (Fo82-87) and microphenocrysts of melilite, perovskite and titanomagnetite in a matrix of clinopyroxene, nepheline, titanomagnetite and rare biotite. Chemical and palaeomagnetic data on two specimens are given by Duncan et al. (1978).
DUNCAN, R.A., HARGRAVES, R.B. and BREY, G.P. 1978. Age, palaeomagnetism and chemistry of melilite basalts in the southern Cape, South Africa. Geological Magazine, 115: 317-27.TALJAARD, M.S. 1937. South African melilite basalts and their relations. Transactions and Proceedings of the Geological Society of South Africa, 39: 281-316.VERWOERD, W.J., VILJOEN, J.H.A. and VILJOEN, K.S. 1990. Olivine melilitites and associated intrusives of the southwestern Cape province. Guidebook Geocongress ’90, Geological Society of South Africa, PR3: 1-60.