gaylussite

noun
gay·lus·site | \ ˈgāləˌsīt \
plural -s

Definition of gaylussite 

: a mineral Na2Ca(CO3)2.5H2O consisting of a yellowish white translucent hydrous carbonate of calcium and sodium

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History and Etymology for gaylussite

French, from J. L. Gay-Lussac + French -ite

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