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Umupira w'amaguru
Umupira wa Tourmaline, uzwi kandi ku izina rya tourmaline ceramsite, umupira w'amabuye y'agaciro ya tourmaline, umupira w'ubutaka ceramic, ni ibintu bishya byabonetse mu gukora no gucumura tourmaline, ibumba n'ibindi bikoresho by'ibanze.Izina ryicyongereza: Tourmaline umupira wamaguru.Ibikoresho nyamukuru ni: tourmaline, ibumba nibindi bikoresho byibanze.Diameter igera kuri 3 ~ 30mm;amabara ni umukara-umukara, umuhondo wijimye, umutuku n'umweru.
