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Arakiite

A valid IMA mineral species
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About ArakiiteHide

Formula:
(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23
Colour:
Red-brown to orange-brown
Lustre:
Earthy
Hardness:
3 - 4
Specific Gravity:
3.41 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Dr. Takaharu Araki [December 22, 1929 Kyoto, Japan - September 07, 2004 Lynwood, Washington, USA], professor at University of Chicago and later translator for Chemical Abstracts, for his numerous mineral crystal-structure determinations and contributions to the science of mineralogy.
This page provides mineralogical data about Arakiite.


Unique IdentifiersHide

Mindat ID:
6805
Long-form identifier:
mindat:1:1:6805:1

Similar NamesHide

ArkiteA rock subtype
ErikiteA discredited species name

IMA Classification of ArakiiteHide

Classification of ArakiiteHide

8.BE.45

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
ArkIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of ArakiiteHide

Earthy
Transparency:
Translucent, Opaque
Colour:
Red-brown to orange-brown
Streak:
Pale-brown, red-brown
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}.
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
3.41 g/cm3 (Calculated)

Optical Data of ArakiiteHide

Type:
Biaxial (-)
RI values:
nα = 1.723 nβ = 1.744 nγ = 1.750
2V:
Measured: 40° to 44°, Calculated: 54°
Birefringence:
0.027
Max. Birefringence:
δ = 0.027
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r > v medium
Pleochroism:
Not Visible

Chemistry of ArakiiteHide

Mindat Formula:
(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23
Element Weights:
Element% weight
Mn40.489 %
O33.409 %
As13.804 %
Fe6.860 %
Zn4.015 %
H1.424 %

Calculated from ideal end-member formula.
Mn
O
As
Fe
Zn
H

Crystallography of ArakiiteHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Setting:
Cc
Cell Parameters:
a = 14.248(8) Å, b = 8.228(4) Å, c = 24.23(1) Å
β = 93.62(3)°
Ratio:
a:b:c = 1.732 : 1 : 2.945
Unit Cell V:
2843 ų
Z:
4
Morphology:
Predominantly anhedral, mica-like.
Twinning:
None observed

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005637ArakiiteCooper M A, Hawthorne F C (1999) The effect of differences in coordination on ordering of polyvalent cations in close-packed structures: The crystal structure of arakiite and comparison with hematolite The Canadian Mineralogist 37 1471-148219990293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
12.07 Å(100)
6.046 Å(100)
5.463 Å(10)
5.262 Å(20)
4.764 Å(15)
4.119 Å(30)
4.040 Å(90)
3.952 Å(10)
3.822 Å(5)
3.648 Å(10)
3.572 Å(5)
3.496 Å(5)
3.404 Å(20)
3.317 Å(5)
3.223 Å(10)
3.148 Å(30)
3.030 Å(70)
2.862 Å(5b)
2.799 Å(5)
2.749 Å(5)
2.700 Å(10)
2.631 Å(20)
2.594 Å(5)
2.546 Å(5)
2.498 Å(20)
2.411 Å(40)
2.372 Å(15)
2.338 Å(15)
2.291 Å(10b)
2.237 Å(5b)
2.157 Å(5b)
2.106 Å(5)
2.065 Å(20b)
2.017 Å(10)
1.905 Å(5)
1.859 Å(20)
1.810 Å(15)
1.777 Å(5)
1.748 Å(20)
1.661 Å(5)
1.619 Å(5)
1.573 Å(20)
1.552 Å(70)
Comments:
Roberts, A., et al. (2000) A New Zn-bearing Hematolite-like Mineral from Varmland, Sweden, Mineralogical Record, v. 30, p. 253-256. Note: Arakiite is very similar to the "Hematolite-like" Group.

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of ArakiiteHide

General Appearance of Type Material:
Thin foliated reddish-colored masses on ore-bearing matrix. Megascopically indistinguishable from dixenite and hematolite.
Place of Conservation of Type Material:
Harvard Mineralogical Museum, Cambridge, Massachusetts, cat. no. 134608.
The Natural History Museum, London, UK, BM1921.310. (additional material)
Chemical Analysis of Type Material:
ZnO4.48 %
MnO34.32 %
MgO12.76 %
Fe2O36.76 %
Al2O32.25 %
As2O36.56 %
As2O515.84 %
H2O (calc)13.74 %
Total:96.71 %
Associated Minerals at Type Locality:

Synonyms of ArakiiteHide

Other Language Names for ArakiiteHide

Dutch:Arakiiet
French:Arakïite
German:Arakiit
Norwegian:Arakiitt
Spanish:Arakiita

Relationship of Arakiite to other SpeciesHide

Other Members of Hematolite Group:
DixeniteCuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6Trig. 3 : R3
Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16Orth. 222 : C2221
McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21Trig. 3m : R3c
SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm(2/m2/m2/m) : Pnma
Turtmannite(Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+xTrig.

Common AssociatesHide

Associations Based on Photo Data:
2 photos of Arakiite associated with RhodochrositeMnCO3

Related Minerals - Strunz-mindat GroupingHide

8.BE.05AugeliteAl2(PO4)(OH)3Mon. 2/m : B2/m
8.BE.10GrattarolaiteFe3+3(PO4)O3Trig. 3m : R3m
8.BE.15CornetiteCu3(PO4)(OH)3Orth. mmm(2/m2/m2/m) : Pbca
8.BE.20ClinoclaseCu3(AsO4)(OH)3Mon. 2/m : P21/c
8.BE.25GilmariteCu3(AsO4)(OH)3Tric. 1 : P1
8.BE.25ArhbariteCu2Mg(AsO4)(OH)3Tric. 1 : P1
8.BE.30FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth. mmm(2/m2/m2/m) : Pnma
8.BE.30ArganditeMn7(VO4)2(OH)8Mon. 2/m : P21/m
8.BE.30RaadeiteMg7(PO4)2(OH)8Mon. 2/m
8.BE.30AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/c
8.BE.35'Mineral E (of Dunn, et. al., 1982)'Orth. mmm(2/m2/m2/m)
8.BE.35Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
8.BE.35Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
8.BE.40Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5Tric.
8.BE.45DixeniteCuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6Trig. 3 : R3
8.BE.45McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21Trig. 3m : R3c
8.BE.45Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
8.BE.45Turtmannite(Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+xTrig.
8.BE.45CarlfrancisiteMn2+3(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42Trig. 3m : R3c
8.BE.45KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16Orth. 222 : C2221
8.BE.50SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm(2/m2/m2/m) : Pnma
8.BE.55Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8Orth. mmm(2/m2/m2/m) : Ccca
8.BE.60KoliciteMn2+7Zn4(AsO4)2(SiO4)2(OH)8Orth. mmm(2/m2/m2/m) : Cmca
8.BE.65Sabelliite(Cu,Zn)2Zn(AsO4,SbO4)(OH)3Trig. 3 : P3
8.BE.70JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 222
8.BE.75TheisiteCu5Zn5(AsO4,SbO4)2(OH)14Orth.
8.BE.80CoparsiteCu4(AsO4,VO4)O2ClOrth. mmm(2/m2/m2/m) : Pbcm
8.BE.85WaterhouseiteMn2+7(PO4)2(OH)8Mon. 2/m : P21/c
8.BE.90VasilseverginiteCu9O4(AsO4)2(SO4)2Mon. 2/m : P21/c

Fluorescence of ArakiiteHide

No fluorescence under SW or LW UV.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for ArakiiteHide

References for ArakiiteHide

Localities for ArakiiteHide

Showing 6 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Sweden (TL)
 
  • Värmland County
    • Filipstad
      • Långban Ore District
Roberts et al. (2000)
Thulin et al. (2007)
RRUFF ID: R060812 +1 other reference
The Swedish Museum of Natural History ...
USA
 
  • New Jersey
    • Sussex County
Hexiong Yang
Hexiong Yang
 
and/or  
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