serpierite
noun
ser·pie·rite
ˈsərpēəˌrīt,
sərˈpiˌr-
plural -s
: a mineral (Cu,Zn,Ca)5(SO4)2(OH)6.3H2O consisting of a hydrous basic sulfate of copper, calcium, and zinc occurring in small tabular bluish green crystals and tufts
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Merriam-Webster unabridged
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