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Arakiite Mineral Data
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General Arakiite Information
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 Chemical Formula: |
(Zn,Mn++)(Mn++,Mg)12(Fe+++,Al)2(AsO3)(AsO4)2(OH)23 |
| Composition: |
Molecular Weight = 1,452.97 gm |
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Magnesium 7.86 % Mg 13.04 % MgO |
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Manganese 27.60 % Mn 35.64 % MnO |
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Aluminum 1.30 % Al 2.46 % Al2O3 |
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Zinc 3.74 % Zn 4.65 % ZnO |
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Iron 5.00 % Fe 7.14 % Fe2O3 |
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Arsenic 15.47 % As 6.81 % As2O3 / 15.82 % As2O5 |
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Hydrogen 1.60 % H 14.26 % H2O |
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Oxygen 37.44 % O |
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______ ______ |
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100.00 % 99.81 % = TOTAL OXIDE |
| Empirical Formula: |
Zn0.83Mn2+7.3Mg4.7Fe3+1.3Al0.7(AsO3)(AsO4)2(OH)23 |
| Environment: |
Megascopically indistinguishable from hematolite or dixenite. |
| IMA Status: |
Approved IMA 1999 (Dana # Added) |
| Locality: |
Found on a museum specimen, previously identified as dixenite from Langban, Varmland, Sweden. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Dr. Takaharu Araki (1929-), University of Chicago, for his numerous crystal-structure contributions to the science of mineralogy. |
| Synonym: |
ICSD 87742 |
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IMA1998-062 |
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PDF 89-821 |
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Arakiite Image |
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Images:
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Arakiite
Comments: Deep red massive arakiite between grains.
Location: Nordmark, Sweden.
Scale: See Image.
© Rruff Database |
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Arakiite Crystallography
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| Axial Ratios: |
a:b:c =1.7316:1:2.9448 |
| Cell Dimensions: |
a = 14.248, b = 8.228, c = 24.23, Z = 4; beta = 93.62° V = 2,834.88 Den(Calc)= 3.40 |
| Crystal System: |
Monoclinic - Domatic H-M Symbol (m) Space Group: Cc |
| 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), |
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Physical Properties of Arakiite
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| Cleavage: |
{001} Perfect |
| Color: |
Reddish brown, Orange brown. |
| Diaphaneity: |
Opaque to translucent |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Habit: |
Micaceous - Platy texture with "flexible" plates. |
| Hardness: |
3-4 - Calcite-Fluorite |
| Luster: |
Resinous - Metallic |
| Streak: |
pale brown |
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Optical Properties of Arakiite
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| Gladstone-Dale: |
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2174,KC= 0.2213
Ncalc = 1.75 |
| 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. |
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Calculated Properties of Arakiite
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| Electron Density: |
Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Arakiite =3.40 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEArakiite = 21.07 barns/electron
U=PEArakiite x rElectron Density= 69.08 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Arakiite is Not Radioactive |
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Arakiite Classification
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| Dana Class: |
46.02.08.02 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites |
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(46.02)with miscellaneous formulae |
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(46.02.08)Dixenite Group |
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46.02.08.01 Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3 |
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46.02.08.02 Arakiite! (Zn,Mn)(Mn,Mg)12(Fe,Al)2(AsO3)(AsO4)2(OH)23 Cc m |
| Strunz Class: |
08.BE.45 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.B - Phosphates, etc. with Additional Anions, without H2O |
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08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1 |
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08.BE.45 Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3 |
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08.BE.45 Hematolite (Mn,Mg,Al)15(AsO3)(AsO4)2(OH)23 R 3 3 |
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08.BE.45 Kraisslite (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 P 6322 6 2 2 |
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08.BE.45 Mcgovernite Mn9Mg4Zn2As2Si2O17(OH)14 R 3c 3 2/m |
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08.BE.45 Turtmannite! (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20x R 3c 3 2/m |
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08.BE.45 Arakiite! (Zn,Mn)(Mn,Mg)12(Fe,Al)2(AsO3)(AsO4)2(OH)23 Cc m |
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Other Arakiite Information
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| References: |
NAME( MinRec, V31, p253) PHYS. PROP.(MinRec, V31, p253) OPTIC PROP.(MinRec, V31, p253) |
| 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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Print or Cut-and-Paste your Arakiite Specimen Label here :
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Arakiite
(Zn,Mn++)(Mn++,Mg)12(Fe+++,Al)2(AsO3)(AsO4)2(OH)23
Dana No: 46.02.08.02 Strunz No: 08.BE.45
Locality:
Notes:
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