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plumbago |
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plumbago (plŭm'bā`gō): see graphite graphite (grăf`īt), an allotropic form of carbon , known also as plumbago and black lead. ..... Click the link for more information. . graphiteor plumbago or black leadMineral allotrope of carbon. It is dark gray to black, opaque, and very soft. Its layered structure, with rings of six atoms arranged in widely spaced parallel sheets, gives it its slippery quality. It occurs in nature and is used (mixed with clay) as the “lead” in pencils. It is also used in lubricants, crucibles, polishes, arc lamps, batteries, brushes for electric motors, and nuclear reactor cores. plumbago [‚pləm′bā·gō] (mineralogy) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Presently she started up, exclaiming that they would be late for breakfast; and they hurried back to the tumble-down house with its pointless porch and unpruned hedge of plumbago and pink geraniums where the Wellands were installed for the winter. [7] At the cataracts of the great rivers Orinoco, Nile, and Congo, the syenitic rocks are coated by a black substance, appearing as if they had been polished with plumbago. |
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