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Arakiite

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About ArakiiteHide

Formula:
(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23
Colour:
Redbrown to orangebrown
Lustre:
Sub-Metallic
Hardness:
3 - 4
Specific Gravity:
3.41 (Calculated)
Crystal System:
Monoclinic
Name:
Named for 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.


Classification of ArakiiteHide

Approved
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

Physical Properties of ArakiiteHide

Sub-Metallic
Transparency:
Translucent, Opaque
Colour:
Redbrown to orangebrown
Streak:
Pale-brown
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Fracture:
Irregular/Uneven
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°
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

Chemical Properties of ArakiiteHide

Formula:
(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23
IMA Formula:
ZnMn2+12Fe3+2(As3+O3)(As5+O4)2(OH)23

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
Morphology:
Predominantly anhedral, mica-like.

Type Occurrence of ArakiiteHide

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 %
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

Synonyms of ArakiiteHide

Other Language Names for ArakiiteHide

German:Arakiit
Spanish:Arakiita

Relationship of Arakiite to other SpeciesHide

Other Members of this group:
DixeniteCuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6Trig.
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.

Related Minerals - Nickel-Strunz 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.25ArhbariteCu2Mg(AsO4)(OH)3Tric. 1 : P1
8.BE.25GilmariteCu3(AsO4)(OH)3Tric.
8.BE.30AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
8.BE.30FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m)
8.BE.30RaadeiteMg7(PO4)2(OH)8Mon. 2/m
8.BE.30ArganditeMn7(VO4)2(OH)8Mon. 2/m : P21/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.
8.BE.45Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
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.45McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21Trig. 3m (3 2/m)
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 (3 2/m) : R3c
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.
8.BE.85WaterhouseiteMn2+7(PO4)2(OH)8Mon. 2/m : P21/b

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.

References for ArakiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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

Internet Links 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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Sweden (TL)
 
  • Värmland County
    • Filipstad
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
Thulin, H. & Strand, U. (2007) Arakiite - Ett nytt Zn-bärande hematolitliknande mineral från Långban, Värmland, Sverige. LångbansNytt, 16: 21-22
RRUFF ID: R060812
Reiner Mielke 2017
USA
 
  • New Jersey
    • Sussex County
      • Franklin Mining District
Heixong Yang
Heixong yang
 
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