guildite

noun
guild·ite | \ˈgilˌdīt\
plural -s

Definition of guildite 

: a dark chestnut brown mineral (Cu,Fe)3(Fe,Al)4(SO4)7(OH)4.15H2O that is a basic hydrated sulfate of copper and iron

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History and Etymology for guildite

Frank N. Guild †1939 American mineralogist + English -ite

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