الجرافيت
الجرافيت. In addition to diamond and fullerene, graphite is the third modifiion of carbon. The metallic gray mineral occurs frequently in nature, usually crystallizes in the hexagonal crystal system and has a layer structure. ... تتوفر آلة الطحن بأحجام هواء تتراوح ما بين 50 إلى 2,400 Nm³ ...