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Akrochordite

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Akrochordite
Bright green, vitreous, cluster of eveite (under 0.5 mm) and brown, subhedral akrochordite in a contrasting, pink, granular carbonate matrix
General
CategoryPhosphate minerals
Formula
(repeating unit)
(Mn,Mg)4(AsO4)2(OH)4.4H2O
Strunz classification8.DD.10
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/c
Identification
ColorYellowish red-brown, pale to dark brown, pale pink
CleavagePerfect. On {010} , perfect; a second, perpendicular to the first.
TenacityBrittle
Mohs scale hardness3+12
LusterSub-Vitreous, resinous, dull
DiaphaneityTranslucent
References[1][2][3]

Akrochordite is an exceptionally rare hydrated hydrous arsenate mineral of the formula (Mn,Mg)4(AsO4)2(OH)4.4H2O and represents a small group of rare in the nature manganese (Mn) arsenates and, similarly to most other Mn-bearing arsenates, possess pinkish colour. It is typically associated with metamorphic Mn deposits.[2][4]

References