Motukoreaite Mineral Data

General Motukoreaite Information

Chemical Formula: Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O) Composition: Molecular Weight = 6,011.40 gm    Sodium      0.76 %  Na    1.03 % Na₂O    Magnesium  15.36 %  Mg   25.48 % MgO    Aluminum   10.77 %  Al   20.35 % Al₂O₃    Hydrogen    3.69 %  H    32.97 % H₂O    Carbon      2.60 %  C     9.52 % CO₂    Sulfur      4.27 %  S    10.65 % SO₃    Oxygen     62.55 %  O              ______        ______               100.00 %      100.00 % = TOTAL OXIDE Empirical Formula: Na₂Mg₃₈Al₂₄(CO₃)₁₃(SO₄)₈(OH)₁₀₈•56(H₂O) Environment: Rim cement in volcanic breccias in weathered submarine environments. IMA Status: Approved IMA 1977 Locality: Brown's Island, (Motukorea) within Waitemata Harbor, New Zealand. Link to MinDat.org Location Data. Name Origin: Named for the Maori name for the locality (Motukorea - "island of the cormorants."). Name Pronunciation: Motukoreaite + Pronunciation Synonym: ICSD 29523   PDF 41-1380  

Motukoreaite Image

Images:

Motukoreaite Crystallography

Axial Ratios: a:c = 1:3.65351 Cell Dimensions: a = 9.172, c = 33.51, Z = 0.4; V = 2,441.37 Den(Calc)= 1.64 Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m X Ray Diffraction: By Intensity(I/I_o): 11.32(1), 3.72(0.7), 5.58(0.6),4.59(0.6), 2.58(0.4), 1.924(0.3), 2.39(0.3), 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

Rius J , Plana F , Neues Jahrbuch fur Mineralogie, Monatshefte , 1986 (1986) p.263-272, Contribution to the superstructure resolution of the double layer, mineral motukoreaite, Locality: the Emile Baudot bank, western Mediterranean

 

Physical Properties of Motukoreaite

Cleavage: {???} Perfect Color: Yellow green, White, Light yellow. Density: 1.48 - 1.53, Average = 1.5 Habit: Fibrous - Crystals made up of fibers. Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) Hardness: 1-1.5 - Talc or a little harder Streak: white  

Optical Properties of Motukoreaite

Gladstone-Dale: CI meas= -0.377 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.264 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.311,KPDmeas= 0.3389,KC= 0.2461
Ncalc = 1.36 - 1.4 Optical Data: Uniaxial (?), a=1.51, b=1.51, bire=0.0000.  

Calculated Properties of Motukoreaite

Electron Density: Bulk Density (Electron Density)=1.69 gm/cc
note: Specific Gravity of Motukoreaite =1.64 gm/cc.
Fermion Index: Fermion Index = 0.01
Boson Index = 0.99 Photoelectric: PE_Motukoreaite = 1.05 barns/electron
U=PE_Motukoreaite x rElectron Density= 1.77 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Motukoreaite is Not Radioactive  

Motukoreaite Classification

Dana Class: 17.01.07.01 (17)Compound Carbonates   (17.01)with miscellaneous formulae   (17.01.07)Dana Group  

17.01.07.01 Motukoreaite Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O) R 3m 3 2/m

Strunz Class: 07.DD.35 07 - SULFATES (SELENATES, TELLURATES)   07.D - Sulfates (selenates, etc.) with additional anions, with H2O   07.DD -With only medium-sized cations; sheets of edge-sharing octahedra  

07.DD.35 Carrboydite (Ni,Cu)14Al9(SO4,CO3)6(OH)43•7(H2O) Unk Hex

 

07.DD.35 Glaucocerinite (Zn,Cu)5Al3(SO4)1.5(OH)16•9(H2O) Unk (HEX-R) Trig

 

07.DD.35 Honessite Ni6Fe2(SO4)(OH)16•4(H2O) R 3m 3 2/m

 

07.DD.35 Hydrowoodwardite! Cu1-xAlx(OH)2(SO4)x/2•n(H2O)with0<x<0.67andn>3x/2 R 3m 3 2/m

 

07.DD.35 Zincowoodwardite! [Zn1-xAlx(OH)2][(SO4)x/2(H2O)n] P 3- or R 3m 3

 

07.DD.35 Hydrohonessite Ni6Fe2(SO4)(OH)16•7(H2O) Unk Hex

 

07.DD.35 Motukoreaite Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O) R 3m 3 2/m

 

07.DD.35 Mountkeithite (Mg,Ni)11(Fe,Cr)3(SO4,CO3)3.5(OH)24•11(H2O) Unk Hex

 

07.DD.35 Shigaite Mn7Al4(SO4)2(OH)22•8(H2O) R 3 3

 

07.DD.35 Natroglaucocerinite! (Na,Zn,Cu)10Al6(SO4)3(OH)32•18(H2O)? Unk

 

07.DD.35 Wermlandite (Ca,Mg)Mg7(Al,Fe)2(SO4)2(OH)18•12(H2O) P 3c1 3 2/m

 

07.DD.35 Nikischerite! NaFe6Al3(SO4)2(OH)18(H2O)12 R 3 3

 

07.DD.35 Zincaluminite Zn6Al6(SO4)2(OH)26•5(H2O) Unk Hex

 

07.DD.35 Woodwardite Cu4Al2(SO4)(OH)12•2-4(H2O) Unk Hex

 

07.DD.35 Zincowoodwardite-3R! [Zn1BxAlx(OH)2][(SO4)x/2•n(H2O)],0.32<x<0.50,n=0.59 R 3m 3 2/m

 

07.DD.35 Zincowoodwardite-1T! [Zn1BxAlx(OH)2][(SO4)x/2•n(H2O)],x=0.33,n.0.96 P 3 3

 

Other Motukoreaite Information

References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) See Also: Links to other databases for Motukoreaite :
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
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Motukoreaite :

A Bijoux Google Search for Motukoreaite
Adam's Minerals Google Search for Motukoreaite
Cape Minerals Google Search for Motukoreaite
Dakota Matrix Minerals Google Search for Motukoreaite
Excalibur Mineral Corp. Google Search for Motukoreaite
Exceptional Minerals Google Search for Motukoreaite
John Betts Fine Minerals Search for Motukoreaite
McDougall Minerals Google Search for Motukoreaite
Mineral News Website Link
Rock and Mineral Shows Google Search for Motukoreaite
Weinrich Minerals, Inc. Google Search for Motukoreaite

Ask about Motukoreaite 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 Motukoreaite Specimen Label here :