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Arakiite

A valid IMA mineral species
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01955810017271928624516.jpg
Arakiite

Franklin Mine, Franklin, Sussex County, New Jersey, USA
09948110017271928659681.jpg
Arakiite, etc.

Moss mine, Nordmark Odal Field, Filipstad, Värmland County, Sweden
01428330017271928695334.jpg
Arakiite

Moss mine, Nordmark Odal Field, Filipstad, Värmland County, Sweden
01955810017271928624516.jpg
Arakiite

Franklin Mine, Franklin, Sussex County, New Jersey, USA
09948110017271928659681.jpg
Arakiite, etc.

Moss mine, Nordmark Odal Field, Filipstad, Värmland County, Sweden
01428330017271928695334.jpg
Arakiite

Moss mine, Nordmark Odal Field, Filipstad, Värmland County, Sweden
01955810017271928624516.jpg
Arakiite

Franklin Mine, Franklin, Sussex County, New Jersey, USA
09948110017271928659681.jpg
Arakiite, etc.

Moss mine, Nordmark Odal Field, Filipstad, Värmland County, Sweden
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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
GUID
(UUID V4):
2163bac4-a211-43ce-a76a-a4ea2f128597

IMA Classification of ArakiiteHide

Classification of ArakiiteHide

Strunz-mindat (2025):
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
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

Lustre:
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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
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
Elements listed:
Al, As, Fe, H, Mg, Mn, O, Zn - search for minerals with similar chemistry

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):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of ArakiiteHide

Type Locality:
ⓘ Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
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:
CalciteHematiteMagnussonite
Reference:
Roberts, A.C., Grice, J.D., Cooper, M.A., Hawthorne, F.C., Feinglos, M.N. (2000) Arakiite, a new Zn-bearing hematolite-like mineral from Långban, Värmland, Sweden. The Mineralogical Record: 31: 253-256.
Download:
http://rruff.info/rruff_1.0/uploads/MR31_253.pdf

Synonyms of ArakiiteHide

Other Language Names for ArakiiteHide

German:Arakiit
Spanish:Arakiita

Relationship of Arakiite to other SpeciesHide

Member of:
Hematolite Group
Other Members of this 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. 2 2 2 : C2 2 21
McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21Trig. 3m (3 2/m)
SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
Turtmannite(Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+xTrig.

Common AssociatesHide

Associated Minerals 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/m 2/m 2/m) : Pbca
8.BE.20ClinoclaseCu3(AsO4)(OH)3Mon. 2/m : P21/b
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/m 2/m 2/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/b
8.BE.35Mineral E (of Dunn, et. al., 1982)Orth. mmm (2/m 2/m 2/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 (3 2/m)
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)42 Trig. 3m (3 2/m) : R3c
8.BE.45KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16Orth. 2 2 2 : C2 2 21
8.BE.50SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.BE.55Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8Orth. mmm (2/m 2/m 2/m) : Ccca
8.BE.60KoliciteMn2+7Zn4(AsO4)2(SiO4)2(OH)8Orth. mmm (2/m 2/m 2/m) : Cmca
8.BE.65Sabelliite(Cu,Zn)2Zn(AsO4,SbO4)(OH)3Trig. 3 : P3
8.BE.70JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2
8.BE.75TheisiteCu5Zn5(AsO4,SbO4)2(OH)14Orth.
8.BE.80CoparsiteCu4(AsO4,VO4)O2ClOrth. mmm (2/m 2/m 2/m) : Pbcm
8.BE.85WaterhouseiteMn2+7(PO4)2(OH)8Mon. 2/m : P21/b
8.BE.90VasilseverginiteCu9O4(AsO4)2(SO4)2Mon. 2/m

Fluorescence of ArakiiteHide

In UV light:
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

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.

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
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