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词汇 allactite
释义

Definition of allactite in English:

allactite

noun əˈlaktʌɪt
Mineralogy
  • A rare reddish-brown or pink mineral consisting of a basic arsenate of manganese, typically occurring as prisms and as crusts on manganese ores.

Origin

Late 19th century; earliest use found in Journal of the Chemical Society. From Swedish allaktit from ancient Greek ἀλλακτ-, stem of ἀλλάσσειν to change (ultimately from ἄλλος other; the guttural suffix is unexplained) + Swedish -it. So called because of the property of changing colour in polarized light depending on the orientation of the crystals (pleochroism).

Definition of allactite in US English:

allactite

nounəˈlaktʌɪt
Mineralogy
  • A rare reddish-brown or pink mineral consisting of a basic arsenate of manganese, typically occurring as prisms and as crusts on manganese ores.

Origin

Late 19th century; earliest use found in Journal of the Chemical Society. From Swedish allaktit from ancient Greek ἀλλακτ-, stem of ἀλλάσσειν to change (ultimately from ἄλλος other; the guttural suffix is unexplained) + Swedish -it. So called because of the property of changing colour in polarized light depending on the orientation of the crystals (pleochroism).

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