gratonite

noun grat·on·ite \ˈgratənˌīt\

Definition of gratonite

plural

-s

  1. :  a mineral Pb9As4S15 consisting of sulfide of lead and arsenic in rhombohedral crystals

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Origin and Etymology of gratonite

Louis C. Graton, born 1880 American geologist + English -ite


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