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Allactite is a rare arsenate mineral of metamorphosed manganese zinc ore deposits. It is found in Sweden and New Jersey, USA. Its name originated from Greek αλλάκτειν (allaktein) meaning "to change", referring to the strong pleochroism of the mineral.

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Mineralogy Database Dictionary

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General Information:
 Chemical Formula:
(Molecular Weight = 798.46 gm)
Manganese 48.16 % Mn
Arsenic 18.77 % As
Hydrogen 1.01 % 
Oxygen 32.06 % 
 Empirical Formula:
 IMA Status:
Accepted IMA 1973
TL: Sweden, Nordmark, Moss mn
Physical Properties:
[???] Good
brown red, greenish brown, purple red, or pink.
4.5 - Between Fluorite and Apatite
Vitreous - Greasy
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