spencerite
noun
spen·cer·ite
-rīt
plural -s
: a mineral Zn4(PO4)2(OH)2.3H2O consisting of a hydrous basic zinc phosphate occurring in pearly white scaly masses and small monoclinic crystals (hardness 2.7, specific gravity 3.1)
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Merriam-Webster unabridged
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