Akatoreite Mineral Data

Akatoreite Mineral Data +

General Akatoreite Information

Chemical Formula:

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

Composition:

Molecular Weight = 1,280.22 gm

Manganese 36.91 % Mn 53.03 % Mn₂O₃

Aluminum 4.43 % Al 8.36 % Al₂O₃

Iron 0.87 % Fe 1.25 % Fe₂O₃

Silicon 17.11 % Si 36.61 % SiO₂

Hydrogen 0.69 % H 6.19 % H₂O

Oxygen 39.99 % O

______ ______

100.00 % 105.44 % = TOTAL OXIDE

Empirical Formula:

Mn³⁺_8.6Fe³⁺_0.2Al_2.1Si_7.8O_23.2(OH)_8.8

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.

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)= 3.45

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaniety:

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= 0.269 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.263 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.205,KPDmeas= 0.2033,KC= 0.278

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:

r_electron=3.35 gm/cc
note: r_Akatoreite=3.45 gm/cc.

Fermion Index

Fermion Index = 0.00836
Boson Index = 0.99164

Photoelectric:

PE_Akatoreite= 10.47 barns/electron
U=PE_Akatoreite x r_electron= 35.06 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Akatoreite is Not Radioactive

Akatoreite Classification

Dana Class:

57.2.3.1 (57)Sorosilicate Insular Si3O10 and Larger Noncyclic Groups

(57.2)with [Si4O13] groups

(57.2.3)Dana Group

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

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

Strunz Class:

VIII/C.35-20 VIII - Silicates

VIII/C - Sorosilicates, other group-silicates

VIII/C.35 - Ruizite - Akatoreite series

VIII/C.35-10 Ruizite CaMnSi2O6(OH)·2(H2O) P 2₁/c 2/m

VIII/C.35-15 Hubeite! Ca2MnFeSi4O12(OH)(H2O)2 P1 1

VIII/C.35-20 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)

Search for Akatoreite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Akatoreite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Akatoreite Mineral Data :

Ask about Akatoreite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Akatoreite

(Mn++,Fe++)9Al2Si8O24(OH)8
Dana No: 57.2.3.1 Strunz No: VIII/C.35-20
Locality:

Notes: