Akatoreite Mineral Data

General Akatoreite Information

Chemical Formula:

(Mn++,Fe++)9Al2Si8O24(OH)8

Composition:

Molecular Weight = 1,282.75 gm

Calcium 0.16 % Ca 0.22 % CaO

Magnesium 0.17 % Mg 0.28 % MgO

Manganese 36.88 % Mn 47.61 % MnO

Aluminum 4.40 % Al 8.31 % Al₂O₃

Iron 0.83 % Fe 1.06 % FeO

Silicon 16.97 % Si 36.30 % SiO₂

Hydrogen 0.69 % H 6.20 % H₂O

Oxygen 39.91 % O

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_8.61Fe²⁺_0.19Mg_0.09Ca_0.05Al_2.09Si_7.75O_23.17(OH)_8.83

Environment:

In a manganiferous metachert and carbonate lens in schists (Akatore Creek, New Zealand); in a manganiferous potassium-rich felsic metavolcanics (Norberg, Sweden).

IMA Status:

Approved IMA 1971

Locality:

In New Zealand, three km south of Akatore Creek, east Otago, South Island. From Norberg, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Akatoreite + Pronunciation

Synonym:

ICSD 41243

PDF 25-533

Akatoreite Image

Images:

Akatoreite Rhodonite

Comments: Brown akatoreite in pink rhodonite.
Location: Akatore Creek, Eastern Otago Peninsula, South Island, New Zealand. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Akatoreite Crystallography

Axial Ratios:

a:b:c =0.8041:1:0.7358

Cell Dimensions:

a = 8.337, b = 10.367, c = 7.629, Z = 1; alpha = 104.96°, beta = 93.81°, gamma = 104.18° V = 616.25 Den(Calc)= 3.46

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.665(1), 3.31(0.9), 2.214(0.8),

Crystal Structure:

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Burns P C , Hawthorne F C , The Canadian Mineralogist , 31 (1993) p.321-329, Edge-sharing MnO4 tetrahedra in the structure of akatoreite,, Mn9Al2Si8O24(OH)8

Physical Properties of Akatoreite

Cleavage:

{010} Perfect, {021} Good

Color:

Orange, Brown.

Density:

3.48

Diaphaneity:

Transparent

Habit:

Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

yellow white

Optical Properties of Akatoreite

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2033,KPDmeas= 0.2033,KC= 0.2106
Ncalc = 1.73

Optical Data:

Biaxial (+), a=1.698, b=1.704, g=1.72, bire=0.0220, 2V(Calc)=64, 2V(Meas)=65.5.

Calculated Properties of Akatoreite

Electron Density:

Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Akatoreite =3.48 gm/cc.

Fermion Index:

Fermion Index = 0.0084648605
Boson Index = 0.9915351395

Photoelectric:

PE_Akatoreite= 10.46 barns/electron
U=PE_Akatoreite x rElectron Density= 35.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Akatoreite is Not Radioactive

Akatoreite Classification

Dana Class:

57.02.03.01 (57)Sorosilicate Insular Si3O10 and Larger Noncyclic Groups

(57.02)with [Si4O13] groups

(57.02.03)Akatoreite Group

57.02.03.01 Akatoreite (Mn,Fe)9Al2Si8O24(OH)8 P1 1

57.02.03.02 Hubeite! Ca2MnFeSi4O12(OH)(H2O)2 P1 1

57.02.03.03 Cassagnaite! (Ca,Mn)4(Fe,Mn,Al)4(OH)4(V,Mg,Al)2(O,OH)4(Si3O10)(SiO4)2 C mcm 2/m 2/m 2/m

Strunz Class:

09.BH.15 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BH -Sorosilicates with Si3O10, Si4O11, etc

09.BH.15 Akatoreite (Mn,Fe)9Al2Si8O24(OH)8 P1 1

Other Akatoreite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Akatoreite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Akatoreite here :
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Print or Cut-and-Paste your Akatoreite Specimen Label here :

Akatoreite

(Mn++,Fe++)9Al2Si8O24(OH)8
Dana No: 57.02.03.01 Strunz No: 09.BH.15
Locality:

Notes: