chalazoidite

noun
chal·​a·​zoid·​ite | \ ˈkaləˌzȯiˌdīt\
plural -s

Definition of chalazoidite

: a spherical body formed during some volcanic eruptions by concentric accretion of pumiceous dust upon a pellet of mud blown into the air from the volcano

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History and Etymology for chalazoidite

Greek chalaza hailstone + English -oid + -ite

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