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syngenite

noun
syn·​ge·​nite | \ˈsinjəˌnīt\
plural -s

Definition of syngenite 

: a mineral K2Ca(SO4)2.H2O consisting of a hydrous calcium potassium sulfate and occurring in colorless or white tabular crystals (hardness 2.5, specific gravity 2.6)

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History and Etymology for syngenite

German syngenit, from Greek syngenēs related + German -it -ite; from its relationship to polyhalite

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