Bulletin - Malawi Geological Survey Department, Issue 29

abundant accessory amphibolite andesine anhedral anhedral grains anorthosite Antiform apatite Basement Complex belt biotite biotite-gneisses Bloomfield cent charnockitic granulites charnockitic rocks Chitana Hill Chongoni Mountain colour index common dambo Dedza area Dedza Hills Dedza Mountain Dedza Perthitic Complex diopside Distribution and field feldspars felsic felsic charnockitic granulites field relationships flakes foliation garnet garnetiferous geochemical gneisses gneissic granite granular granulites and gneisses graphite graphite-gneiss hornblende hypersthene interbanded intrusive iron oxides Lakeshore Plain large anhedral leucocratic Lifisi Lilongwe Linthipe Meta-anorthosite mafic mafic charnockitic granulites mafic minerals magmatic mainly Maonde margins microperthite migmatitic miles Mlunduni monzonite narrow bands Nkhoma north-east occasional occur oligoclase paragneisses perthite-gneisses perthitic rocks perthitic syenite perthosites Petrography plagioclase pleochroism predominate quartz quartzo-feldspathic granulites red-brown regional metamorphism Rift Fault Rift Valley Rift Valley scarp rock types samples sandy clay sheet sodic soils South Lilongwe Plain southern Malawi specimens sphene syenite Synform texture thin sections Village zircon