Definition of holdenite
: a mineral (Mn,Ca)4(Zn,Mg,Fe)2(AsO4)(OH)5O2 consisting of a basic manganese zinc arsenate with minor calcium, magnesium, and iron and occurring as red orthorhombic crystals at Franklin, New Jersey
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Origin and Etymology of holdenite
Albert F. Holden †1913 American mining engineer + English -ite
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