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Akatoreite

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About AkatoreiteHide

Formula:
Mn2+9Al2Si8O24(OH)8
Colour:
Yellow-orange to orange-brown
Lustre:
Vitreous
Hardness:
6
Crystal System:
Triclinic
Name:
Named after its discovery locality at Akatore in New Zealand.
Chemically and structurally similar to bunnoite.


Classification of AkatoreiteHide

Approved
Approval Year:
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

Physical Properties of AkatoreiteHide

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

Optical Data of AkatoreiteHide

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 AkatoreiteHide

Formula:
Mn2+9Al2Si8O24(OH)8
Common Impurities:
Ti,Fe,Mg,Ca

Crystallography of AkatoreiteHide

Crystal System:
Triclinic
Cell Parameters:
a = 8.33 Å, b = 10.36 Å, c = 7.62 Å
α = 104.46°, β = 93.81°, γ = 104.18°
Ratio:
a:b:c = 0.804 : 1 : 0.736
Unit Cell 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.

Geological EnvironmentHide

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

Type Occurrence of AkatoreiteHide

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.
Geological Setting of Type Material:
In a manganiferous metachert and carbonate lens in schists
Associated Minerals at Type Locality:

Synonyms of AkatoreiteHide

Other Language Names for AkatoreiteHide

German:Akatoreit
Italian:Akatoreite
Latvian:Akatoreīts
Spanish:Akatoreita

Common AssociatesHide

Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
PyrolusiteMn4+O2
RhodochrositeMnCO3
Associated Minerals Based on Photo Data:
1 photo of Akatoreite associated with RhodoniteMn2+SiO3

Related Minerals - Nickel-Strunz GroupingHide

9.BH.05AminoffiteCa2(Be,Al)(Si2O7)(H2O,OH)Tet.
9.BH.10KinoiteCa2Cu2(H2O)2[Si3O10]Mon. 2/m : P21/m
9.BH.20FencooperiteBa6Fe3+3Si8O23(CO3)2Cl3 · H2OTrig. 3m : P3m1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.16.1KanonaiteMn3+Al(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
16.16.2SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
16.16.3DavreuxiteMnAl6Si4O17(OH)2Mon.
16.16.4SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
16.16.5CarpholiteMn2+Al2(Si2O6)(OH)4Orth.
16.16.6KellyiteMn2+2Al(AlSiO5)(OH)4Hex. 6 : P63
16.16.7PennantiteMn2+5Al(AlSi3O10)(OH)8Tric.
16.16.9Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2OMon.
16.16.10Mangano-ferri-eckermannite{Na}{Na2}{Mn2+4Fe3+}Si8O22(OH)2Mon.
16.16.11Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2Mon.
16.16.13HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13Tric.
16.16.14Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2OMon.
16.16.15Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2OMon. 2/m : B2/b
16.16.16Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44Tric.
16.16.17ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14Trig. 3 : R3
16.16.18CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14Trig.
16.16.19HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
16.16.20MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3Mon.
16.16.21Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2Mon.
16.16.22Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
16.16.23OkhotskiteCa2Mn3+Mn3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
16.16.24Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
16.16.25Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon.

Other InformationHide

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 AkatoreiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Read, P.B., Reay, A. (1971) Akatoreite, a new manganese silicate from eastern Otago, New Zealand. American Mineralogist; 56: 416-426.
Ounchanum, P. & Morad, S. (1987): Paragenesis of akatoreite and ganophyllite in the manganiferous rocks of the Häste Field, Norberg ore district, central Sweden. Neues Jahrbuch für Mineralogie, Abhandlungen 157, 225-244.
Burns, P.C. & Hawthorne, F.C. (1993): Edge-sharing Mn2+O4 tetrahedra in the structure of akatoreite, Mn92+Al2Si8O24(OH)8. Canadian Mineralogist 31, 321-329.
Jambor, J.L., Grew, E.S. (1994) New mineral names. American Mineralogist: 79: 185-189.

Internet Links for AkatoreiteHide

Localities for AkatoreiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Austria
 
  • Tyrol
    • Innsbruck-Land District
      • Navis
Kolitsch, U., Schachinger, T., Auer, C. (2019): 2113) Akatoreit(?), Albit, Ardennit-(As), Ardennit-(V), „Ardennit-(Si)“, Baryt, Brandtit(?) (oder unbenanntes Ca2Mn(AsO4)2?), Coelestin, Fluorapatit, Fluorcalcioroméit, Frankdicksonit(?), Friedelit, Ganophyllit(?), Hämatit, Hausmannit, Hollandit, Jacobsit, Klinochlor, Kutnohorit, Manganberzeliit, Manganiandrosit-(La)-Manganiakasakait-(La)-Mischkristalle, Muskovit, Opal(?), Pennantit, Piemontit(?), Pyrobelonit, Pyrophanit, Quarz, Rhodochrosit, Rhodonit, Sarkinit, Schallerit, Spessartin, Svabit, Tephroit, Tilasit und Tiragalloit vom Navisbach, Navistal, Nordtirol. Pp. 251-260 in Walter, F. et al. (2019): Neue Mineralfunde aus Österreich LXVIII. Carinthia II, 209./129., 237-362.
Italy
 
  • Piedmont
    • Cuneo Province
      • 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]; Piccoli, G.C., Vanini, F., Ciriotti, M.E., Marengo, A., Bittarello, E., Cámara, F., Kolitsch, U., Bracco, R., Balestra, C., Odicino, G., Brizio, P. (2020): Eggletonite e tamaite del Monte Maniglia, Bellino, Cuneo, Piemonte con aggiornamento sulla mineralogia locale. Micro, 18, 60-66.
Japan
 
  • Kochi Prefecture
    • Agawa District
      • Ino
The Mineral Species of Japan (5th ed) Matsubara; Nishio-Hamane, D., Momma, K., Miyawaki, R., Minakawa, T. (2016): Bunnoite, a new hydrous manganese aluminosilicate from Kamo Mountain, Kochi prefecture, Japan. Mineralogy and Petrology 110, 917-926.
New Zealand (TL)
 
  • Otago Region
    • Clutha District
Read, P.B. & Reay, A. (1971): Akatoreite, a new manganese silicate from eastern Otago, New Zealand. American Mineralogist, 56, 416-426.; Railton, G.T., Watters, W.A. (1990) Minerals of New Zealand. New Zealand Geological Survey Bulletin 104, 89 pages.
Sweden
 
  • Västmanland County
    • Norberg
Ounchanum, P. & Morad, S. (1987): Paragenesis of akatoreite and ganophyllite in the manganiferous rocks of the Häste Field, Norberg ore district, central Sweden. Neues Jahrbuch für Mineralogie, Abhandlungen 157, 225-244.
 
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