Note:
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.