Alkaline Rocks and Carbonatites of the World

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Occurrence number: 
Longitude: 32.33, Latitude: -25.88

Tephrite and phonolite have been described from an area 18 km north of Boane (Assunçao et al., 1962, Fig. 9). They lie amongst Karoo basalts. A rock described as passing from tephrite into phonolite contains phenocrysts of nepheline and aegirine-augite and microphenocrysts of magnetite and titanite in a fine-grained matrix containing microlites of sanidine and albite-oligoclase, aegirine-augite, opaque oxides and analcime. A tephrite comprises phenocrysts of augite, hornblende and nepheline in a groundmass with microlites of andesine-labradorite and accessory magnetite and apatite.

ASSUNÇÃO, C.F.T. de, COELHO, A.V.T.P. and ROCHA, A.T. 1962. Petrologia das lavas dos Libombos (Moçambique). Estudos, Ensaios e Documentos, Junta de Investigações do Ultramar, Lisboa, 99: 1-74.
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