nounSouth African Mining Geology
A gold-bearing conglomerate of quartz pebbles in a quartzitic matrix found in the Witwatersrand, South Africa (also with capital initial); (in extended use) any conglomerate of quartz pebbles in a quartzitic matrix visually similar to this. Usually as a mass noun; also "banket conglomerate".
Late 19th century; earliest use found in Diamond Fields Advertiser. From Afrikaans banket, transferred use of banket confection resembling almond hardbake from Dutch banket any of various kinds of sweet food, specific use of banket.