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galactite

noun
ga·​lac·​tite | \gəˈlakˌtīt\
plural -s

Definition of galactite 

: an unidentified soluble stone possibly of calcium nitrate whose milky solution gave rise to many legends and superstitions in medieval times

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First Known Use of galactite

15th century, in the meaning defined above

History and Etymology for galactite

Middle French or Latin; Middle French galactite, from Latin galactites, from Greek galaktitēs (lithos) stone that makes water milky, from galakt-, gala milk

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The first known use of galactite was in the 15th century

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