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Arakiite

Big Photo

Långban, Filipstad, Värmland, Sweden
© Knut Eldjarn

Formula:
(Zn,Mn
2+
 
)(Mn
2+
 
,Mg)
 
12
(Fe
3+
 
,Al)
 
2
(AsO
 
3
)(AsO
 
4
)
 
2
(OH)
 
23
System:MonoclinicLustre:Resinous
Hardness:3 - 4
Name:Named for Dr. Takaharu Araki (1929-), University of Chicago, for his numerous crystal-structure contributions to the science of mineralogy.
This page provides mineralogical data about Arakiite.

Classification of Arakiite

IMA status:Approved
Nickel-Strunz 10th (pending) edition ID: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
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Type Occurrence of Arakiite

Type Locality:Långban, Filipstad, Värmland, Sweden

Physical Properties of Arakiite

Lustre:Resinous
Hardness (Mohs):3 - 4

Crystallography of Arakiite

Crystal System:Monoclinic

Optical Data of Arakiite

Type:Biaxial (-)
RI values: nα = 1.723 nβ = 1.744 nγ = 1.750
2V:Measured: 40° to 44°, Calculated: 54°
Maximum Birefringence:δ = 0.027

Chart 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 Arakiite

Formula:
(Zn,Mn
2+
 
)(Mn
2+
 
,Mg)
 
12
(Fe
3+
 
,Al)
 
2
(AsO
 
3
)(AsO
 
4
)
 
2
(OH)
 
23
Essential elements:As, Fe, H, Mn, O, Zn
All elements listed in formula:Al, As, Fe, H, Mg, Mn, O, Zn

Relationship of Arakiite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BE.05Augelite
Al
 
2
[(OH)
 
3
|PO
 
4
]
8.BE.10Grattarolaite
Fe
3+
3
[O
 
3
|PO
 
4
]
8.BE.15Cornetite
Cu
 
3
[(OH)
 
3
|PO
 
4
]
8.BE.20Clinoclase
Cu
 
3
[(OH)
 
3
|AsO
 
4
]
8.BE.25Arhbarite
Cu
 
2
Mg[(OH)
 
3
|AsO
 
4
]
8.BE.25Gilmarite
Cu
 
3
[(OH)
 
3
|AsO
 
4
]
8.BE.30Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
8.BE.30Flinkite
Mn
2+
2
Mn
3+
 
AsO
 
4
(OH)
 
4
8.BE.30Raadeite
Mg
 
7
(PO
 
4
)
 
2
(OH)
 
8
8.BE.35Chlorophoenicite
(Mn,Mg)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.35Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.40Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
AsO
 
4
(OH)
 
5
8.BE.45Dixenite
CuMn
2+
14
Fe
2+
 
[(OH)
 
6
|(AsO
 
3
)
 
5
|AsO
 
4
|(SiO
 
4
)
 
2
]
8.BE.45Hematolite
(Mn,Mg,Al)
 
15
(AsO
 
3
)(AsO
 
4
)
 
2
(OH)
 
23
8.BE.45Kraisslite
(Mn
2+
 
,Mg)
 
24
Zn
 
4
[(OH)
 
12
|(AsO
 
4
)
 
4
|(SiO
 
4
)
 
8
]
8.BE.45Mcgovernite
(Mn,Mg,Zn)
 
273
As
3+
~12
As
5+
~30
Si
 
~42
O
 
324
(OH)
 
252
8.BE.45Turtmannite
(Mn,Mg)
 
22.5
Mg
 
3-3x
[(V,As)O
 
4
]
 
3
[SiO
 
4
]
 
3
[AsO
 
3
]
 
x
O
 
5-5x
(OH)
 
20+x
8.BE.50Synadelphite
Mn
2+
9
[(OH)
 
9
|As
3+
 
O
 
3
|(As
5+
 
O
 
4
)
 
2
] · 2H
 
2
O
8.BE.55Holdenite
(Mn
2+
 
,Mg)
 
6
Zn
 
3
[(OH)
 
8
|(AsO
 
4
)
 
2
|SiO
 
4
]
8.BE.60Kolicite
Mn
2+
7
Zn
 
4
[(OH)
 
8
|(AsO
 
4
)
 
2
|(SiO
 
4
)
 
2
]
8.BE.65Sabelliite
(Cu,Zn)
 
2
Zn[(OH)
 
3
|(AsO
 
4
,SbO
 
4
)]
8.BE.70Jarosewichite
Mn
 
3
MnAsO
 
4
(OH)
 
6
8.BE.75Theisite
Cu
 
5
Zn
 
5
[(OH)
 
7
|(AsO
 
4
,SbO
 
4
)]
 
2
8.BE.80Coparsite
Cu
 
4
[O
 
2
|Cl|(AsO
 
4
,VO
 
4
)]
8.BE.85Waterhouseite
Mn
2+
7
[(OH)
 
8
|(PO
 
4
)
 
2
]

Other Names for Arakiite

Synonyms:
IMA1998-062
Other Languages:
German:Arakiit
Russian:Аракиит
Spanish:Arakiita

Other Information

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

References for Arakiite

Reference List:Canadian Mineralogist: 37: 1471-1482.

Mineralogical Record: 31: 253-256.

Internet Links for Arakiite

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  • Raman and XRD data at RRUFF project
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  • Search for Arakiite in the Natural History Museum (London) online catalogue
  • Arakiite details from Handbook of Mineralogy (PDF)
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    Localities for Arakiite

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Sweden
     
    • Värmland
      • Filipstad
    		Min.Rec.(2000) 31, 253-256
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 11th Nov 2009 17:41:09