Nechelyustovite Mineral Data

General Nechelyustovite Information

Chemical Formula:

(Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}•4.5H2O

Composition:

Molecular Weight = 880.23 gm

Potassium 0.76 % K 0.91 % K₂O

Barium 11.70 % Ba 13.06 % BaO

Sodium 5.75 % Na 7.75 % Na₂O

Strontium 2.49 % Sr 2.94 % SrO

Calcium 0.96 % Ca 1.34 % CaO

Cerium 0.32 % Ce 0.37 % Ce₂O₃

Titanium 12.35 % Ti 20.60 % TiO₂

Manganese 3.87 % Mn 5.00 % MnO

Niobium 7.07 % Nb 10.12 % Nb₂O₅

Iron 0.25 % Fe 0.33 % FeO

Silicon 12.76 % Si 27.30 % SiO₂

Hydrogen 1.15 % H 10.28 % H₂O

Oxygen 40.58 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba_0.75Sr_0.25K_0.17Ce_0.02Ca_0.01Na_2.2Ti_0.94Mn²⁺_0.62Ca_0.2Fe²⁺_0.04Ti_1.33Nb_0.67O₂Si₄ O₁₄(H₂O)_0.7O_1.3ï¿½4.32(H₂O)

Environment:

Found in hydrothermally altered pegmatite body emplaced in the nepheline syenites near their contact with ijolite-urtites. Bafertisite series.

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Kirov mine, Mount Kukisvumchorr, Khibina alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

N.A.

Synonym:

IMA2006-021

Nechelyustovite Image

Images:

Nechelyustovite

Comments: Nechelyustovite aggregate.
Location: Kirovsky Mine, Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Russia. Scale: Grid Size 1 mm.
© Sergey Vasiliev / Systematic Mineralogy

Nechelyustovite Crystallography

Axial Ratios:

a:b:c =0.7642:1:6.8323

Cell Dimensions:

a = 5.38, b = 7.04, c = 48.1, Z = 4; beta = 91.1° V = 1,821.46 Den(Calc)= 3.21

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/m

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

By Intensity(I/I_o): 24.06(1), 5.95(0.97), 7.05(0.9),3.95(0.6), 2.712(0.19), 2.828(0.16), 2.155(0.13),

Physical Properties of Nechelyustovite

Cleavage:

{001} Perfect, {100} Good

Color:

Creamy, Grayish, Bluish, Yellowish.

Density:

3.32 - 3.42, Average = 3.37

Diaphaneity:

Transparent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Nechelyustovite

Gladstone-Dale:

CI meas= 0.156 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.113 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2226,KPDmeas= 0.2121,KC= 0.2511
Ncalc = 1.81 - 1.86

Optical Data:

Biaxial (+), a=1.7, b=1.71, g=1.734, bire=0.0340

Calculated Properties of Nechelyustovite

Electron Density:

Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Nechelyustovite =3.21 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Nechelyustovite}= 67.43 barns/electron
U=PE_{Nechelyustovite} x r_electron= 207.99 barns/cc.

Radioactivity:

GRapi = 336.76 (Gamma Ray American Petroleum Institute Units)
Concentration of Nechelyustovite per GRapi unit = 0.30 (%)

Estimated Radioactivity from Nechelyustovite - barely detectable

Nechelyustovite Classification

Dana Class:

56.02.06b.05 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.02)with cations in [4] and/or >[4] coordination

(56.02.06b)Seidozerite - Lamprophyllite group (Bafertisite subgroup)

56.02.06b.01 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m

56.02.06b.02 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 2₁/m 2/m

56.02.06b.03 Nafertisite! Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7•2(H2O) A2/m 2/m

56.02.06b.04 Surkhobite! KBa3Ca2Na2(Mn,Fe,Fe)16Ti8(Si2O7)8O8(OH)4(F,O,OH)8 C 2 2

56.02.06b.05 Nechelyustovite! (Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}•4.5H2O P 2/m 2/m

56.02.06b.06 Caryochroite! (Na,Sr)3(Fe,Mg)10[Ti2Si12O37](O,OH)9•8H2O P 2/n (?) 2/m

Strunz Class:

09.BE.55 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.55 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m

09.BE.55 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 2₁/m 2/m

09.BE.55 Nechelyustovite! (Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}•4.5H2O P 2/m 2/m

Other Nechelyustovite Information

References:

NAME( EurJMin, v21:251) PHYS. PROP.(EurJMin, v21:251) OPTIC PROP.(EurJMin, v21:251)

See Also:

Links to other databases for Nechelyustovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Nechelyustovite

(Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}•4.5H2O
Dana No: 56.02.06b.05 Strunz No: 09.BE.55
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