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Akatoreite

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Akatoreite

Maniglia Mt. Mine, Bellino, Varaita Valley, Cuneo Province, Piedmont, Italy
Akatoreite, etc.

Akatore Creek, Clutha District, Otago Region, South Island, New Zealand
Akatoreite

Akatore Creek, Clutha District, Otago Region, South Island, New Zealand
Akatoreite

Maniglia Mt. Mine, Bellino, Varaita Valley, Cuneo Province, Piedmont, Italy
Akatoreite, etc.

Akatore Creek, Clutha District, Otago Region, South Island, New Zealand
Akatoreite

Akatore Creek, Clutha District, Otago Region, South Island, New Zealand
Akatoreite

Maniglia Mt. Mine, Bellino, Varaita Valley, Cuneo Province, Piedmont, Italy
Akatoreite, etc.

Akatore Creek, Clutha District, Otago Region, South Island, New Zealand
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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

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

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

Physical Properties of AkatoreiteHide

Lustre:
Vitreous
Transparency:
Transparent
Colour:
Yellow-orange to orange-brown
Streak:
yellowish white
Hardness:
6 on Mohs scale
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
Elements listed:
Al, H, Mn, O, Si - search for minerals with similar chemistry
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.

Type Occurrence of AkatoreiteHide

Type Locality:
ⓘ Akatore Creek, Clutha District, Otago Region, 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.
Geological Setting of Type Material:
In a manganiferous metachert and carbonate lens in schists
Associated Minerals at Type Locality:
TodorokiteTinzeniteSpessartineRhodoniteRhodochrosite
QuartzPyroxmangiteApatiteAlabanditeAlabandite

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:
Rhodonite1 photo of Akatoreite associated with Rhodonite on mindat.org.

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.
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
16.16.23OkhotskiteCa2(Mn,Mg)(Mn3+,Al,Fe3+)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

ⓘ - 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.
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; 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)
 
  • South Island
    • Otago Region
      • Clutha District
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
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.
Mineral and/or Locality  
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