Graphite

Crystal system: hexagonal Department 
Chemical composition: C 
Characteristics: the Department of elemental carbon graphite (C) the crystallization of one mineral, and diamond of the same polymorph as carbon precursors (Polymorphism), hardness of 1 ~ 2, the proportion of 2.23, color was gray to black metal to earthy luster, opaque, Streak is black, cleavage completely, have good electrical conductivity and thermal conductivity, numerate, lubricity and fire resistance, it is very difficult and oxidation together, free from any influence of acids, at very high temperature, the change is not melting point as high as 3000 ℃. 
Occurrence: natural graphite depending on the nature of appearance and is divided into: flake graphite, earthy graphite or amorphous graphite. Prolific at the regional or contact metamorphic rocks, such as quartzite and black schist and slate between or among the slate are often associated with calcite, quartz symbiotic; produced in Taiwan are less of low-grade purity graphite. 
Uses: electrode, brush, carbon rods, crucibles, pencils heart. And oil mixture can be used by mill agents, lubricants. Another can be used as a casting model, Tu-type, pigments, refractories, batteries, battery, filled pad materials.