Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Akatoreite

This page is currently not sponsored. Click here to sponsor this page.
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.


Hide all sections | Show all sections

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.

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
PyrolusiteMnO2
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+4(Fe3+)]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.
Jambor, J.L., Grew, E.S. (1994) New mineral names. American Mineralogist: 79: 185-189.
Burns, P.C., Hawthorne, F.C. (1993) Edge–sharing Mn2+O4 tetrahedra in the structure of akatoreite, Mn2+9Al2Si8O24(OH)8. The Canadian Mineralogist: 31: 321-329.

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.
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
      • 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
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  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 21, 2017 00:11:03 Page generated: September 13, 2017 00:36:53
Go to top of page