Manganokukisvumite Mineral Data

Manganokukisvumite Mineral Data

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General Manganokukisvumite Information

Chemical Formula:

Na6MnTi4Si8O28·4(H2O)

Composition:

Molecular Weight = 1,130.79 gm

Potassium 0.17 % K 0.21 % K₂O

Sodium 11.81 % Na 15.92 % Na₂O

Calcium 0.07 % Ca 0.10 % CaO

Cerium 0.12 % Ce 0.15 % Ce₂O₃

Magnesium 0.15 % Mg 0.25 % MgO

Titanium 16.43 % Ti 27.41 % TiO₂

Manganese 4.32 % Mn 5.58 % MnO

Niobium 0.49 % Nb 0.71 % Nb₂O₅

Aluminum 0.10 % Al 0.18 % Al₂O₃

Iron 0.44 % Fe 0.57 % FeO

Silicon 19.89 % Si 42.56 % SiO₂

Hydrogen 0.71 % H 6.37 % H₂O

Oxygen 45.28 % O

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

Na_5.81K_0.05Ca_0.02Ce_0.01Mn²⁺_0.89Fe²⁺_0.09Mg_0.07Al_0.04Ti_3.88Nb_0.06Si_8.01O₂₈·4(H₂O)

Environment:

Small cavities in albite-rich syenite breccia. Mn-dominanat analogue of kukisvumite and closely related to lintisite.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named as the manganese-dominant analogue of kukisvumite.

Synonym:

IMA2002-029

Manganokukisvumite Image

Images:

Manganokukisvumite

Comments: Scanning electron photomicrograph of manganokukisvumite. (CanMin, v 42 , p 782).
Location: Mont Saint-Hilaire, Quebec. Scale: See Image.
© Canadian Mineralogist

Manganokukisvumite Crystallography

Axial Ratios:

a:b:c =3.3732:1:0.6061

Cell Dimensions:

a = 29.05, b = 8.612, c = 5.22, Z = 2; V = 1,305.93 Den(Calc)= 2.88

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pccn

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

By Intensity(I/I_o): 14.47(1)(200), 3.025(0.4)(910), 2.881(0.2)(521),6.43(0.2)(310), 4.83(0.1)(600), 2.146(0.1)(930), 2.458(0.1)(402), 2.591(0.1)(721), 3.743(0.1)(701),

Physical Properties of Manganokukisvumite

Cleavage:

None

Color:

Colorless.

Density:

2.86

Diaphaniety:

Transparent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Manganokukisvumite

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2538,KPDmeas= 0.2556,KC= 0.2638

Optical Data:

Biaxial (-), a=1.657, b=1.741-1.747, g=1.789-1.795, bire=0.1320-0.1380, 2V(Calc)=68-70, 2V(Meas)=70. Dispersion dispersion not observed.

Calculated Properties of Manganokukisvumite

Electron Density:

r_electron=2.81 gm/cc
note: r_{Manganokukisvumite}=2.86 gm/cc.

Fermion Index

Fermion Index = 0.03099
Boson Index = 0.96901

Photoelectric:

PE_{Manganokukisvumite}= 6.18 barns/electron
U=PE_{Manganokukisvumite} x r_electron= 17.38 barns/cc.

Radioactivity:

GRapi = 132.37 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Manganokukisvumite - barely detectable

Manganokukisvumite Classification

Dana Class:

65.1.6.4 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.6)Lorenzenite group

65.1.6.1 Lorenzenite Na2Ti2Si2O9 P bcn 2/m 2/m 2/m

65.1.6.2 Kukisvumite Na6ZnTi4Si8O28·4(H2O) Pccn 2/m 2/m 2/m

65.1.6.3 Lintisite Na3LiTi2Si4O14·2(H2O) C 2/c 2/m

65.1.6.4 Manganokukisvumite ! Na6MnTi4Si8O28·4(H2O) Pccn 2/m 2/m 2/m

Strunz Class:

VIII/C.03-58 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.03 - Rankinite - Cebollite series

VIII/C.03-10 Rankinite Ca3Si2O7 P 2₁/a 2/m

VIII/C.03-20 Kilchoanite Ca3Si2O7 I2cm mm2

VIII/C.03-30 Cebollite Ca5Al2(SiO4)3(OH)4 Unk Ortho

VIII/C.03-58 Manganokukisvumite Na6MnTi4Si8O28·4(H2O) Pccn 2/m 2/m 2/m

Other Manganokukisvumite Information

References:

NAME( CanMin, v 42, p 781) PHYS. PROP.(CanMin, v 42, p 781) OPTIC PROP.(CanMin, v 42, p 781)

See Also:

Links to other databases for Manganokukisvumite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Manganokukisvumite

Na6MnTi4Si8O28·4(H2O)
Dana No: 65.1.6.4 Strunz No: VIII/C.03-58
Locality:

Notes: