Motukoreaite Mineral Data

Motukoreaite Mineral Data +

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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.").

Synonym:

ICSD 29523

PDF 41-1380

Motukoreaite Image

Images:

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

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

$Help on X Ray Diffraction:$ 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:

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drag2 - RMB Resize/Rotate
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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

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

Optical Data:

Uniaxial (?), a=1.51, b=1.51, bire=0.0000.

Calculated Properties of Motukoreaite

Electron Density:

r_electron=1.69 gm/cc
note: r_Motukoreaite=1.64 gm/cc.

Fermion Index

Fermion Index = 0.01627
Boson Index = 0.98373

Photoelectric:

PE_Motukoreaite= 1.05 barns/electron
U=PE_Motukoreaite x r_electron= 1.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Motukoreaite is Not Radioactive

Motukoreaite Classification

Dana Class:

17.1.7.1 (17)Compound Carbonates

(17.1)with miscellaneous formulae

(17.1.7)Dana Group

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

Strunz Class:

VI/D.14-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.14 - Metavoltine - Slavikite series

VI/D.14-10 Metavoltine K4Na4(Fe,Zn)Fe6(SO4)12O2·20(H2O) P 3 3

VI/D.14-20 Motukoreaite Na2Mg38Al24(CO3)13(SO4)8(OH)108·56(H2O) R 3m 3 2/m

VI/D.14-22 Nikischerite! NaFe6Al3(SO4)2(OH)18(H2O)12 R 3 3

VI/D.14-23 Shigaite Mn7Al4(SO4)2(OH)22·8(H2O) R 3 3

VI/D.14-25 Wermlandite (Ca,Mg)Mg7(Al,Fe)2(SO4)2(OH)18·12(H2O) P 3c1 3 2/m

VI/D.14-30 Lannonite HCa4Mg2Al4(SO4)8F9·32(H2O) Unk Tetra

VI/D.14-40 Slavikite NaMg2Fe5(SO4)7(OH)6·33(H2O) R 3 3

Other Motukoreaite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Motukoreaite

Na2Mg38Al24(CO3)13(SO4)8(OH)108·56(H2O)
Dana No: 17.1.7.1 Strunz No: VI/D.14-20
Locality:

Notes: