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Akatoreite

Big Photo

Akatore Creek, Dunedin, Otago, South Island, New Zealand
© Knut Eldjarn

Formula:
(Mn
2+
 
,Fe
2+
 
)
 
9
Al
 
2
[(OH)
 
3
|HSi
 
4
O
 
13
]
 
2
System:TriclinicColour:brown-orange
Lustre:VitreousHardness:6
Name:Named after its discovery locality at Akatore in New Zealand.
This page provides mineralogical data about Akatoreite.

Classification of Akatoreite

IMA status:Approved 1969
Strunz 8th edition ID:8/C.35-20
Nickel-Strunz 10th (pending) edition ID:9.BH.15

9 : SILICATES (Germanates)
B : Sorosilicates
H : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in tetrahedral [4] and greater coordination
Dana 8th edition ID:57.2.3.1

57 : SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
2 : Insular Si3O10 and Larger Noncyclic Groups with [Si4O13] groups
Hey's CIM Ref.:16.16.8

16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
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Type Occurrence of Akatoreite

Type Locality:Akatore Creek, Dunedin, Otago, South Island, New Zealand
Year of Discovery:1971

Physical Properties of Akatoreite

Lustre:Vitreous
Colour:brown-orange
Streak:yellowish white
Hardness (Mohs):6
Cleavage:Perfect

Crystallography of Akatoreite

Crystal System:Triclinic
Cell Parameters:a = 8.33Å, b = 10.36Å, c = 7.62Å
α = 104.46°, β = 93.81°, γ = 104.18°
Ratio:a:b:c = 0.804 : 1 : 0.736
Unit Cell Volume:V 611.63 ų (Calculated from Unit Cell)

Optical Data of Akatoreite

Type:Biaxial (+)
RI values: nα = 1.698 nβ = 1.704 nγ = 1.720
2V:Measured: 65° , Calculated: 64°
Maximum Birefringence:δ = 0.022

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:relatively strong

Chemical Properties of Akatoreite

Formula:
(Mn
2+
 
,Fe
2+
 
)
 
9
Al
 
2
[(OH)
 
3
|HSi
 
4
O
 
13
]
 
2
Essential elements:H, Mn, O, Si
All elements listed in formula:Al, Fe, H, Mn, O, Si
Common Impurities:Ti,Fe,Mg,Ca

Relationship of Akatoreite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BH.05Aminoffite
Ca
 
2
(Be,Al)Si
 
2
O
 
7
(OH)·H
 
2
O
9.BH.10Kinoite
Ca
 
2
Cu
 
2
(H
 
2
O)
 
2
[Si
 
3
O
 
10
]
9.BH.20Fencooperite
Ba
 
6
Fe
3+
3
Si
 
8
O
 
23
(CO
 
3
)
 
2
Cl
 
3
·H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
16.16.1Kanonaite
Mn
3+
 
Al[O|SiO
 
4
]
16.16.2Spessartine
Mn
2+
3
Al
 
2
[SiO
 
4
]
 
3
16.16.3Davreuxite
MnAl
 
6
Si
 
4
O
 
17
(OH)
 
2
16.16.4Sursassite
Mn
 
2
Al
 
3
[(OH)
 
3
|SiO
 
4
|Si
 
2
O
 
7
]
16.16.5Carpholite
Mn
2+
 
Al
 
2
[(OH)
 
4
|Si
 
2
O
 
6
]
16.16.6Kellyite
Mn
2+
2
Al[(OH)
 
4
|AlSiO
 
5
]
16.16.7Pennantite
(Mn
 
5
Al)(Si
 
3
Al)O
 
10
(OH)
 
8
16.16.9Ganophyllite
(K,Na,Ca)
 
2
Mn
 
8
(Si,Al)
 
12
(O,OH)
 
32
·8H
 
2
O
16.16.10Kôzulite
[Na][Na
 
2
][Mn
2+
4
(Fe
3+
 
,Al)][(OH)
 
2
|Si
 
8
O
 
22
]
16.16.11Masutomilite
(K,Rb)(Li,Mn
3+
 
,Al)
 
3
[(F,OH)
 
2
|AlSi
 
3
O
 
10
]
16.16.13Howieite
Na(Fe,Mn)
 
10
(Fe,Al)
 
2
Si
 
12
O
 
31
(OH)
 
13
16.16.14Eggletonite
(Na,K,Ca)
 
2
(Mn,Fe)
 
8
(Si,Al)
 
12
O
 
29
(OH)
 
7
·11H
 
2
O
16.16.15Bannisterite
Ca
 
0.5
(K,Na)
 
0.5
(Mn,Fe,Zn)
 
10
(Si,Al)
 
16
O
 
38
(OH)
 
8
·5.5H
 
2
O
16.16.16Taneyamalite
(Na,Ca)(Mn,Mg,Fe)
 
12
Si
 
12
(O,OH)
 
44
16.16.17Zussmanite
K(Fe,Mg,Mn)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
16.16.18Coombsite
K(Mn,Fe,Mg)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
16.16.19Henritermierite
Ca
 
3
(Mn
3+
 
,Al)
 
2
[(OH)
 
4
|(SiO
 
4
)
 
2
]
16.16.20Macfallite
Ca
 
2
(Mn
3+
 
,Al)
 
3
[(OH)
 
3
|SiO
 
4
|Si
 
2
O
 
7
]
16.16.21Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
[O|(OH)
 
2
|SiO
 
4
]
16.16.22Piemontite
{Ca
 
2
}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
16.16.23Okhotskite
Ca
 
8
(Mn
2+
 
,Mg)
 
4
(Mn
3+
 
,Al,Fe)
 
8
Si
 
12
O
 
56-n
(OH)
 
n
16.16.24Pumpellyite-(Mn2+)
Ca
 
2
(Mn
2+
 
,Mg)(Al,Mn
3+
 
,Fe
3+
 
)
 
2
[(OH)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
16.16.25Piemontite-(Sr)
{CaSr}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]

Other Names for Akatoreite

Synonyms:
IMA1969-015
Other Languages:
German:Akatoreit
Italian:Akatoreite
Latvian:Akatoreīts
Russian:Акатореит
Spanish:Akatoreita

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 Akatoreite

Reference List:American Mineralogist: 56: 416-426.

American Mineralogist: 79: 189.

Canadian Mineralogist: 31: 321-329.

Internet Links for Akatoreite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Akatoreite details from Handbook of Mineralogy (PDF)
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    Localities for Akatoreite

    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.
    Italy
     
    • Piedmont
      • Cuneo Province
        • Varaita Valley
          • Bellino
    		Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp. [SXRD analysis by Uwe Kolitsch]
    Japan
     
    • Shikoku Island
      • Kochi Prefecture
    		The Mineral Species of Japan (5th ed) Matsubara
    New Zealand
     
    • South Island
      • Otago
        • Dunedin
    		Amer. Mineral. (1971) 56, 416-426; Railton, G.L. & Watters, W.A., Minerals of New Zealand, New Zealand Geological Survey Bull. #104 (1990).
    Sweden
     
    • Västmanland
      • Norberg
    Mineral and/or Locality
    Google
     
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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: 24th Oct 2009 16:06:18