Graphite in Igneous Rocks and Meteorites


Small amounts of Graphite are known to be a primary mineral in igneous rocks. It is known as tiny particles in basalt flows and syenite. It is also known to form in pegmatite. Some iron meteorites contain small amounts of Graphite. These forms of Graphite are occurrences without economic importance. Graphite and diamond are the two mineral forms of carbon—diamond forms in the mantle under extreme heat and pressure. Most Graphite found near Earth's surface was formed within the crust at lower temperatures and pressures. Graphite and diamond share the same composition but have very different structures. The carbon atoms in Graphite are linked in a hexagonal network which forms one-atom-thick sheets. These sheets are poorly connected and easily cleave or slide over one another if subjected to a small amount of force. This gives Graphite its very low hardness, perfect cleavage, and slippery feel.

In contrast, the carbon atoms in diamonds are linked to a framework's structure. Every carbon atom is linked into a three-dimensional network with four other carbon atoms with strong covalent bonds. This arrangement holds the atoms firmly in place, making the diamond exceptionally hard. "Synthetic graphite" is made by heating high-carbon materials like petroleum coke and coal-tar pitch to 2500 to 3000 degrees Celsius. All volatile materials and many metals in the feedstock are destroyed or driven off at these high temperatures. The Graphite that remains links into a sheet-like crystalline structure. Synthetic Graphite can have a purity of over 99% carbon, and it is used in manufactured products where extremely pure material is required. If you are looking for high quality, high purity, and cost-effective Graphite, or if you require the latest price, please feel free to email contact mis-asia.

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