natural graphite
A mineral found in nature. It consists of graphitic carbon regardless of its crystalline perfection.
Some natural graphites, often in the form of large flakes, show very high crystalline perfection. Occasionally, they occur as single crystals of @G02684@. The use of the term natural @G02684@ as a synonym for the term '@G02684@ single crystal' is incorrect and should be avoided. Varieties of natural @G02684@ with lower structural perfection are classified as 'microcrystalline natural @G02684@'. Commercial natural @G02684@ is often contaminated with other minerals, e.g. silicates, and may contain @R05385@ due to intensive milling.
PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 497 (