Akatoreite
This page is currently not sponsored. Click here to sponsor this page.
About Akatoreite
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.
Type Locality:
Classification of Akatoreite
Approved
Approval year:
1969
8/C.35-20
9.BH.15
9 : SILICATES (Germanates)
B : Sorosilicates
H : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in tetrahedral [4] and greater coordination
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
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
16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
Physical Properties of Akatoreite
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}
Good on {010} , poor on {0_12}
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.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong
Chemical Properties of Akatoreite
Formula:
Mn2+9Al2Si8O24(OH)8
Common Impurities:
Ti,Fe,Mg,Ca
Crystallography of Akatoreite
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°
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.
{021}, lamellar in thin section.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005298 | Akatoreite | Burns P C, Hawthorne F C (1993) Edge-sharing MnO4 tetrahedra in the structure of akatoreite, Mn9Al2Si8O24(OH)8 The Canadian Mineralogist 31 321-329 | ![]() | 1993 | 0 | 293 |
CIF Raw Data - click here to close
Geological Environment
Geological Setting:
in manganiferous potassium-rich felsic metavolcanics (Norberg, Sweden).
Type Occurrence of Akatoreite
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 Akatoreite
Other Language Names for Akatoreite
Common Associates
Ganophyllite | (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O |
Pyrolusite | Mn4+O2 |
Rhodochrosite | MnCO3 |
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
9.BH. | Bunnoite | Mn2+6AlSi6O18(OH)3 | Tric. 1 : P1 |
9.BH.05 | Aminoffite | Ca2(Be,Al)(Si2O7)(H2O,OH) | Tet. |
9.BH.10 | Kinoite | Ca2Cu2(H2O)2[Si3O10] | Mon. 2/m : P21/m |
9.BH.20 | Fencooperite | Ba6Fe3+3Si8O23(CO3)2Cl3 · H2O | Trig. 3m : P3m1 |
Related Minerals - Hey's Chemical Index of Minerals Grouping
16.16.1 | Kanonaite | Mn3+Al(SiO4)O | Orth. mmm (2/m 2/m 2/m) : Pnnm |
16.16.2 | Spessartine | Mn2+3Al2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
16.16.3 | Davreuxite | MnAl6Si4O17(OH)2 | Mon. |
16.16.4 | Sursassite | Mn2+2Al3(SiO4)(Si2O7)(OH)3 | Mon. 2/m : P21/m |
16.16.5 | Carpholite | Mn2+Al2(Si2O6)(OH)4 | Orth. |
16.16.6 | Kellyite | Mn2+2Al(AlSiO5)(OH)4 | Hex. 6 : P63 |
16.16.7 | Pennantite | Mn2+5Al(AlSi3O10)(OH)8 | Tric. |
16.16.9 | Ganophyllite | (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O | Mon. |
16.16.10 | Mangano-ferri-eckermannite | {Na}{Na2}{Mn2+4Fe3+}Si8O22(OH)2 | Mon. |
16.16.11 | Masutomilite | (K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2 | Mon. |
16.16.13 | Howieite | Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13 | Tric. |
16.16.14 | Eggletonite | (Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O | Mon. |
16.16.15 | Bannisterite | (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O | Mon. 2/m : B2/b |
16.16.16 | Taneyamalite | (Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44 | Tric. |
16.16.17 | Zussmanite | K(Fe,Mg,Mn)13(Si,Al)18O42(OH)14 | Trig. 3 : R3 |
16.16.18 | Coombsite | KMn2+13(Si,Al)18O42(OH)14 | Trig. |
16.16.19 | Henritermierite | Ca3Mn3+2(SiO4)2[◻(OH)4] | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
16.16.20 | Macfallite | Ca2Mn3+3(SiO4)(Si2O7)(OH)3 | Mon. |
16.16.21 | Ottrélite | (Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2 | Mon. |
16.16.22 | Piemontite | {Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
16.16.23 | Okhotskite | Ca2Mn2+Mn3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
16.16.24 | Pumpellyite-(Mn2+) | Ca2Mn2+Al2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
16.16.25 | Piemontite-(Sr) | {CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH) | Mon. |
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:
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 Akatoreite
mindat.org URL:
https://www.mindat.org/min-68.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
Localities for Akatoreite
Locality List




All localities listed without proper references should be considered as questionable.
Austria | |
| 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 | |
| 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 | |
| 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) | |
| 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 | |
| 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. |
Maniglia Mt. Mine, Bellino, Cuneo Province, Piedmont, Italy