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allactite

noun
al·​lac·​tite | \ əˈlakˌtīt\
plural -s

Definition of allactite

: a mineral consisting of a brownish red basic manganese arsenate Mn7(AsO4)2(OH)8

First Known Use of allactite

1884, in the meaning defined above

History and Etymology for allactite

International Scientific Vocabulary allact- (irregular from Greek allag-, stem of allassein to change, from allos other) + -ite; originally formed as Swedish allaktit

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