Bulletin - Malawi Geological Survey Department, Issue 16

abundant accessories aegirine aegirine-augite aggregates albite alkaline granite amphibole analyses anhedral apatite bands Basement Complex biotite biotite-gneisses calcite cent Changalumi Chaone charnockitic charnockitic gneisses charnockitic granulites Chikala Chilwa Alkaline Province Chinduzi Chingale Ring Structure clinopyroxene coarse colluvium colour index contain corroded crystals diopside Distribution and field dolerite Domasi dykes escarpment feet feldspar feldspathic felsic felsic minerals fenitized ferromagnesian minerals field relationships fine-grained flakes foliation forms foyaites garnet garnetiferous Garson gneisses grain-size granular granulites Hill hornblende hypersthene intergrown interstitial intrusion Junguni lenticular mafic mafic minerals Malosa marble microcline microfoyaite microgranite microperthite microtexture miles Mongolowe nepheline nepheline-syenite Ntonya outcrops pale green paragneisses patches pegmatites perthosite perthosite-gneiss Petrography phenocrysts phyric pink plagioclase plates pleochroic porphyritic potash feldspar pulaskite pyriboles pyroxene quartz quartz-syenite quartzofeldspathic ridge Rift Valley ring-complexes ring-dyke Rivi-Rivi road rocks rutile selvedge Shire sodic sölvsbergite specimens sphene Stream syenite tabular texture titanomagnetite types usually vein-microperthite veins xenoliths zircon Zomba Zomba Mountain