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Akatoreite

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Big Photo

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

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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
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:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Akatoreite details from Handbook of Mineralogy (PDF)
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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.
    Hide Locality List
    (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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