Igishushanyo cya peteroli ya Graphite (GPC) Ubwoko: FC: 99% min S: 0.05max ivu: 0.5% max VM: 0.5% max Ubushuhe: 0.5% max Ingano: 0.5-3mm; 1-5mm, 3-8mm, 8-30mm, 0-30mm Gupakira: Imifuka ya Jumbo (Ukurikije ibyo abakiriya basabwa, dushobora gutanga ibisobanuro bitandukanye nubunini.)