Mineral Information and Data:

Arakiite
ZnMn2+12Fe3+2AsO3(AsO4)2(OH)23 [CNMNC approved formula]

Named for Dr. Takaharu Araki (1929-), University of Chicago, for his numerous crystal-structure contributions to the science of mineralogy.

IMA status : Approved Species 1998 (IMA1998-062)
CLASSIFICATION 
Dana
(8th edition) :
46.02.08.02  (This Dana# Added)
  (46) Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
  (46.02) with miscellaneous formulae
  (46.02.08) Dixenite Group
  
Nickel-Strunz
(10th edition) :
08.BE.45
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BE) With only medium-sized cations, (OH, etc.):RO4 > 2:1
  
Crystal system: Monoclinic System
Point group (H-M): m — domatic
Unit cell: a = 14.248 Å, b = 8.228 Å, c = 24.23 Å, β = 93.62°
Crystal Habit: Platy texture with "flexible" plates., Aggregates - Made of numerous individual crystals or clusters., Anhedral Grains - Granular minerals without the expression of crystal shapes
  
Color: Reddish brown, orange brown
Diaphaneity: Opaque to translucent
Luster: Resinous - metallic
Hardness (Mohs): 3 - 4
Measured Density: 3.4 (calculated) g/cm3
Cleavage: Perfect [001]
Tenacity: Brittle
Fracture: Uneven
Streak: Pale brown
  
Geologic Setting: As a component of stalactites and crusts on the walls of caves containing bat
guano deposits.
Mineral Association: Biphosphammite, aphthitalite, halite, syngenite, stercorite, oxammite, weddellite, whitlockite, guanine, newberyite, calcite, mundrabillaite
  
Other Properties: H2O Soluble.

 

Arakiite
Deep red massive arakiite between grains.
Origin: Nordmark, Sweden.
Photo: © Rruff Project

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