Agate wani nau'in siliki ne na microcrystalline, musamman chalcedony, wanda ke da ingancin hatsi da hasken launi.Babban tsafta na agate na Brazil (97.26% SiO2) ƙwallan kafofin watsa labaru, masu jurewa da juriya ga acid (ban da HF) da sauran ƙarfi, ana amfani da waɗannan bukukuwan a duk lokacin da ƙananan samfuran samfuran suna buƙatar niƙa ba tare da gurɓata ba.Daban-daban masu girma dabam na agate niƙa bukukuwa samuwa: 3mm zuwa 30mm.Ana amfani da ƙwallan kafofin watsa labaru da yawa a fannonin Ceramics, Electronics, Light Industry, Medicine, Food, Geology, Chemical Engineering da sauransu.