Motukoreaite Mineral Data

Motukoreaite Mineral Data
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General Motukoreaite Information

Help on Chemical Formula: Chemical Formula: Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O)
Help on Environment: Environment: Rim cement in volcanic breccias in weathered submarine environments.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Brown's Island, (Motukorea) within Waitemata Harbor, New Zealand. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Maori name for the locality (Motukorea - "island of the cormorants.").
Help on Name Pronunciation: Name Pronunciation: Motukoreaite + Pronunciation Say MOTUKOREAITE
Help on Synonym: Synonym: ICSD 29523
  PDF 41-1380
 

Motukoreaite Image

Click Here for Larger Motukoreaite Image in a New Browser Window Images:
Click Here for Larger Motukoreaite Image

Motukoreaite

Comments: Colorless, tabular crystals of motukoreaite.
Location: Stradnerkogel Quarry, Wilhelmsdorf, Styria, Austria. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Motukoreaite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:3.65351
Help on Cell Dimensions: Cell Dimensions: a = 9.172, c = 33.51, Z = 0.4; V = 2,441.37 Den(Calc)= 1.64
Help on Crystal System: Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),
Click Here for Large Motukoreaite Structure Window Crystal Structure:

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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

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

Optical Properties of Motukoreaite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (?), a=1.51, b=1.51, bire=0.0000.
 

Calculated Properties of Motukoreaite

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

Motukoreaite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Motukoreaite

Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O)
Dana No: 17.01.07.01 Strunz No: 07.DD.35
Locality:

 

Notes: