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Name of the Mineral
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Allactite
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Chemical formula
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Mn7(AsO4)2(OH)8
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Length/Longest Diameter (cm)
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L:8, H:4, W:5
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Description (Colour, habit, form, hardness, lustre,Streak, feel,Twinning, Cleavage, Fracture any special property)
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Brownish-red colour, cleavage
distinct on {001}, uneven fracture, brittle, vitreous lustre, slightly greasy on fracture surface, faint brown streak |
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Class
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Arsenate
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Crystallographic Details
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Monoclinic System
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Locality
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Langban, Shyttan
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State/Country
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Sweden
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Photo Link
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CHQ_CCU_GSI_MUS_0604
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Date of Photography
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12/14/2016
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Allactite
Allactite is a rare arsenate mineral of metamorphosed manganese zinc ore deposits. It is found in Sweden and New Jersey, US. Its name originated from Greek αλλάκτειν (allaktein) meaning "to change", referring to the strong pleochroism of the mineral.