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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
IMA symbolAkr[1]
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[2][3][4]

Akrochordite is a rare hydrated arsenate mineral with the chemical formula (Mn,Mg)4(AsO4)2(OH)4·4H2O and represents a small group of rare manganese (Mn) arsenates and, similarly to most other Mn-bearing arsenates, possess pinkish colour. It is typically associated with metamorphic Mn deposits.[3][5]

References

[edit]
  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Mineralienatlas
  3. ^ a b Mindat
  4. ^ Webmineral data
  5. ^ Handbook of Mineralogy