plumbago

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plumbago

(plŭm'bā`gō): see graphitegraphite
, an allotropic form of carbon, known also as plumbago and black lead. It is dark gray or black, crystalline (often in the form of slippery scales), greasy, and soft, with a metallic luster.
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plumbago

[‚pləm′bā·gō]
(mineralogy)

graphite, plumbago

One of the forms under which carbon occurs in nature; electrically conductive; in powdered form, used as a lubricant.