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Akatoreite

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Formula:
(Mn2+,Fe2+)9Al2(HSi4O13)2(OH)6
System:
Triclinic
Colour:
Yellow-orange to ...
Lustre:
Vitreous
Hardness:
6
Name:
Named after its discovery locality at Akatore in New Zealand.
This page provides mineralogical data about Akatoreite.

Classification of Akatoreite

Approved 1969
9.BH.15

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

57 : SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
2 : Insular Si3O10 and Larger Noncyclic Groups with [Si4O13] groups
16.16.8

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

Place of Conservation of First Recorded 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 First Recorded Material:
In a manganiferous metachert and carbonate lens in schists

Occurrences of Akatoreite

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

Physical Properties of Akatoreite

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
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°
Max Birefringence:
δ = 0.022
Image 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:
(Mn2+,Fe2+)9Al2(HSi4O13)2(OH)6
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Fe,Mg,Ca

Relationship of Akatoreite to other Species

9.BH.05AminoffiteCa2(Be,Al)(Si2O7)(H2O,OH)
9.BH.10KinoiteCa2Cu2(H2O)2[Si3O10]
9.BH.20FencooperiteBa6Fe33+Si8O23(CO3)2Cl3 · H2O
16.16.1KanonaiteMn3+Al(SiO4)O
16.16.2SpessartineMn32+Al2(SiO4)3
16.16.3DavreuxiteMnAl6Si4O17(OH)2
16.16.4SursassiteMn22+Al3(Si2O7)(SiO4)(OH)3
16.16.5CarpholiteMn2+Al2(Si2O6)(OH)4
16.16.6KellyiteMn22+Al(AlSiO5)(OH)4
16.16.7PennantiteMn52+Al(AlSi3O10)(OH)8
16.16.9Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
16.16.10Mangano-ferri-eckermannite[Na][Na2][Mn42+(Fe3+)]Si8O22(OH)2
16.16.11Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
16.16.13HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
16.16.14Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O
16.16.15BannisteriteCa0.5(K,Na)0.5(Mn,Fe,Zn)10(Si,Al)16O38(OH)8 · 5.5H2O
16.16.16Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44
16.16.17ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14
16.16.18CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14
16.16.19HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
16.16.20MacfalliteCa2(Mn3+,Al)3(Si2O7)(SiO4)(OH)3
16.16.21Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2
16.16.22Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
16.16.23OkhotskiteCa2(Mn2+,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
16.16.24Pumpellyite-(Mn2+)Ca2(Mn2+,Mg)(Al,Mn3+,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
16.16.25Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)

Other Names for Akatoreite

Name in Other Languages:
German:Akatoreit
Italian:Akatoreite
Latvian:Akatoreīts
Spanish:Akatoreita

Other Information

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 Akatoreite

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

American Mineralogist: 79: 189.

Canadian Mineralogist: 31: 321-329.

Internet Links for Akatoreite

Localities for Akatoreite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
      • Ino
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  
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