Akrochordite

Akrochordite

Bright green, vitreous, cluster of eveite (under 0.5 mm) and brown, subhedral akrochordite in a contrasting, pink, granular carbonate matrix
General
Category Phosphate minerals
Formula
(repeating unit)
(Mn,Mg)4(AsO4)2(OH)4.4H2O
Strunz classification 8.DD.10
Crystal system Monoclinic
Crystal class Prismatic (2/m)
H-M symbol: (2/m)
Space group P21/c
Identification
Color Yellowish red-brown, pale to dark brown, pale pink
Cleavage Perfect. On {010} , perfect; a second, perpendicular to the first.
Tenacity Brittle
Mohs scale hardness
Luster Sub-Vitreous, resinous, dull
Diaphaneity Translucent
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

  1. Mineralienatlas
  2. 1 2 Mindat
  3. Webmineral data
  4. Handbook of Mineralogy
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