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Akatoreite

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Formula:
(Mn
2+
 
,Fe
2+
 
)
 
9
Al
 
2
(HSi
 
4
O
 
13
)
 
2
(OH)
 
6
System:TriclinicColour:Yellow-orange to ...
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
Place of Conservation of Type Material:University of Otago, Dunedin; Geological Survey of New Zealand, Lower Hutt, New Zealand; National Museum of Natural History, Washington, D.C., USA, 137285, 142541.
Year of Discovery:1969
Geological Setting of type material:In a manganiferous metachert and carbonate lens in schists
Associated Minerals at type locality:
TodorokiteTinzeniteSpessartineRhodoniteRhodochrosite
QuartzPyroxmangiteApatiteAlabanditeAlabandite

Occurrences of Akatoreite

Geological Setting:in manganiferous potassium-rich felsic metavolcanics (Norberg, Sweden).

Physical Properties of Akatoreite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Yellow-orange to orange-brown
Streak:yellowish white
Hardness (Mohs):6
Cleavage:Perfect
Good on {010} , poor on {0_12}

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)
Morphology:Rarely as sheaves, to 1 cm, of radiating prisms, elongated and striated parallel[100] ; fibrous, fine granular, massive.
Twinning:Twinning: On {021} twin axis perpindicular
{021}, lamellar in thin section.

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
(HSi
 
4
O
 
13
)
 
2
(OH)
 
6
Simplified for copy/paste:(Mn2+,Fe2+)9Al2(HSi4O13)2(OH)6
Essential elements:Al, 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

Common Associates:
RhodochrositePyrolusiteGanophyllite
Related Minerals - Nickel-Strunz Grouping):

- +
9.BH.05Aminoffite
Ca
 
2
(Be,Al)(Si
 
2
O
 
7
)(H
 
2
O,OH)
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(SiO
 
4
)O
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+
2
Al
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
3
16.16.5Carpholite
Mn
2+
 
Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
16.16.6Kellyite
Mn
2+
2
Al(AlSiO
 
5
)(OH)
 
4
16.16.7Pennantite
Mn
2+
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
16.16.9Ganophyllite
(K,Na,Ca)
 
2
Mn
 
8
(Si,Al)
 
12
(O,OH)
 
32
· 8H
 
2
O
16.16.10Mangano-arfvedsonite
[Na][Na
 
2
][Mn
2+
4
(Fe
3+
 
)]Si
 
8
O
 
22
(OH)
 
2
16.16.11Masutomilite
(K,Rb)(Li,Mn
3+
 
,Al)
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
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
(SiO
 
4
)
 
2
(OH)
 
4
16.16.20Macfallite
Ca
 
2
(Mn
3+
 
,Al)
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
3
16.16.21Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
(SiO
 
4
)O(OH)
 
2
16.16.22Piemontite
{Ca
 
2
}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
16.16.23Okhotskite
Ca
 
2
(Mn
2+
 
,Mg)(Mn
3+
 
,Al,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
· H
 
2
O
16.16.24Pumpellyite-(Mn2+)
Ca
 
2
(Mn
2+
 
,Mg)(Al,Mn
3+
 
,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
· H
 
2
O
16.16.25Piemontite-(Sr)
{CaSr}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)

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

Search Engines:
  • Look for Akatoreite on Google
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  • External Links:
  • Look for Akatoreite on Webmineral
  • Look for Akatoreite on Athena Mineralogy
  • Look for Akatoreite on Wikipedia
  • Look for Akatoreite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Akatoreite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Akatoreite

    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
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. 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 thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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