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Arakiite Mineral Data

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General Arakiite Information

Help on Chemical  Formula: Chemical Formula: (Zn,Mn++)(Mn++,Mg)12(Fe+++,Al)2(AsO3)(AsO4)2(OH)23
Help on Composition: Composition: Molecular Weight = 1,452.97 gm
   Magnesium   7.86 %  Mg   13.04 % MgO
   Manganese  27.60 %  Mn   35.64 % MnO
   Aluminum    1.30 %  Al    2.46 % Al2O3
   Zinc        3.74 %  Zn    4.65 % ZnO
   Iron        5.00 %  Fe    7.14 % Fe2O3
   Arsenic    15.47 %  As    6.81 % As2O3 / 15.82 % As2O5
   Hydrogen    1.60 %  H    14.26 % H2O
   Oxygen     37.44 %  O
             ______        ______ 
             100.00 %       99.81 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn0.83Mn2+7.3Mg4.7Fe3+1.3Al0.7(AsO3)(AsO4)2(OH)23
Help on Environment: Environment: Megascopically indistinguishable from hematolite or dixenite.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Found on a museum specimen, previously identified as dixenite from Langban, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Dr. Takaharu Araki (1929-), University of Chicago, for his numerous crystal-structure contributions to the science of mineralogy.
Help on Synonym: Synonym: ICSD 87742
  PDF 89-821

Arakiite Image

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Comments: Deep red massive arakiite between grains.
Location: Nordmark, Sweden. Scale: See Image.
© Rruff Database

Arakiite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7316:1:2.9448
Help on Cell Dimensions: Cell Dimensions: a = 14.248, b = 8.228, c = 24.23, Z = 4; beta = 93.62° V = 2,834.88 Den(Calc)= 3.40
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.07(1), 6.046(1), 4.04(0.9),1.552(0.7), 3.03(0.7), 2.411(0.4), 3.148(0.3),

Physical Properties of Arakiite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Reddish brown, Orange brown.
Help on Diaphaneity: Diaphaneity: Opaque to translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Resinous - Metallic
Help on Streak: Streak: pale brown

Optical Properties of Arakiite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2174,KC= 0.2213
Ncalc = 1.75
Help on Optical Data: Optical Data: Biaxial (-), a=1.723, b=1.744, g=1.75, bire=0.0270, 2V(Calc)=54, 2V(Meas)=40-44. Dispersion r > v medium.

Calculated Properties of Arakiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Arakiite =3.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEArakiite = 21.07 barns/electron
U=PEArakiite x rElectron Density= 69.08 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Arakiite is Not Radioactive

Arakiite Classification

Help on  Dana Class: Dana Class: (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
  (46.02)with miscellaneous formulae
  (46.02.08)Dixenite Group Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3 Arakiite! (Zn,Mn)(Mn,Mg)12(Fe,Al)2(AsO3)(AsO4)2(OH)23 Cc m
Help on  Strunz Class: Strunz Class: 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
08.BE.45 Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3
08.BE.45 Hematolite (Mn,Mg,Al)15(AsO3)(AsO4)2(OH)23 R 3 3
08.BE.45 Kraisslite (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 P 6322 6 2 2
08.BE.45 Mcgovernite Mn9Mg4Zn2As2Si2O17(OH)14 R 3c 3 2/m
08.BE.45 Turtmannite! (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20x R 3c 3 2/m
08.BE.45 Arakiite! (Zn,Mn)(Mn,Mg)12(Fe,Al)2(AsO3)(AsO4)2(OH)23 Cc m

Other Arakiite Information

Help on References: References: NAME( MinRec, V31, p253) PHYS. PROP.(MinRec, V31, p253) OPTIC PROP.(MinRec, V31, p253)
Help on See Also: See Also: Links to other databases for Arakiite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 08.BE.45





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