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variolite

noun
var·​i·​o·​lite | \ˈverēəˌlīt, ˈva(a)r-\
plural -s

Definition of variolite 

: a basic rock embedded with whitish spherules

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First Known Use of variolite

1781, in the meaning defined above

History and Etymology for variolite

probably from New Latin variolites, from Medieval Latin variola pustule, pox + Latin -ites -ite

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The first known use of variolite was in 1781

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