A rare mineral composed of manganese oxide, typically found in oxidized manganese ore deposits.
From Greek a- (not) + laktos (milky) + -ite (mineral suffix), named because the mineral doesn't have the milky appearance of some similar minerals.
Allactite was named by mineralogists in a clever way—they called it 'non-milky' because it looked darker and more opaque than similar manganese minerals nearby in the same rocks.
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