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Manganoneptunite Mineral Data

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General Manganoneptunite Information

Help on Chemical  Formula: Chemical Formula: KNa2Li(Mn,Fe++)2Ti2Si8O24
Help on Composition: Composition: Molecular Weight = 906.78 gm
   Potassium   4.31 %  K     5.19 % K2O
   Sodium      5.07 %  Na    6.84 % Na2O
   Lithium     0.77 %  Li    1.65 % Li2O
   Titanium   10.56 %  Ti   17.62 % TiO2
   Manganese   9.09 %  Mn   11.73 % MnO
   Iron        3.08 %  Fe    3.96 % FeO
   Silicon    24.78 %  Si   53.01 % SiO2
   Oxygen     42.35 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KNa2LiMn2+1.5Fe2+0.5Ti2Si8O24
Help on Environment: Environment: Found in syenites and syenite pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1923
Help on Locality: Locality: Lovozero Massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition and relationship to neptunite.
Help on Synonym: Synonym: Mangan-neptunite - Renamed as Manganoneptunite by Mineralogical Record, v330 (2008), p131

Manganoneptunite Image

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Comments: Dark brown crystal of mangan-neptunite on matrix.
Location: Kibblehouse quarry, Perkiomenville, Pennsylvania, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Shkatulkalite   Manganoneptunite

Comments: Pearly white shkatulkalite with brown mangan-neptunite grains.
Location: Shkatulka pegmatite, Umbozero mine, Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Manganoneptunite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3125:1:0.802
Help on Cell Dimensions: Cell Dimensions: a = 16.38, b = 12.48, c = 10.01, Z = 4; beta = 115.4° V = 1,848.47 Den(Calc)= 3.26
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.506(1), 2.485(1), 1.483(0.9),

Physical Properties of Manganoneptunite

Help on Color: Color: Red.
Help on Density: Density: 3.23
Help on Diaphaneity: Diaphaneity: Subopaque
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Manganoneptunite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.081 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.217,KPDmeas= 0.219,KC= 0.2383
Ncalc = 1.77 - 1.78
Help on Optical Data: Optical Data: Biaxial (+), a=1.697, b=1.7, g=1.725, bire=0.0280, 2V(Calc)=40, 2V(Meas)=36.

Calculated Properties of Manganoneptunite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Manganoneptunite =3.23 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEManganoneptunite = 6.43 barns/electron
U=PEManganoneptunite x relectron= 20.26 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 60.70 (Gamma Ray American Petroleum Institute Units)
Concentration of Manganoneptunite per GRapi unit = 1.65 (%)

Estimated Radioactivity from Manganoneptunite - barely detectable


Manganoneptunite Classification

Help on  Dana Class: Dana Class: (70)Inosilicate Column or Tube Structures
  (70.04)with linked chains forming cages
  (70.04.01)Neptunite group Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m Manganoneptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m Watatsumiite! Na2KMn2LiV2Si8O24 Cc m IMA2009-009 KNa2Li(Mg,Fe)2Ti2Si8O24 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EH.05 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EH -Transitional structures between phyllosilicate and other silicate units
09.EH.05 Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m
09.EH.05 Manganoneptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m
09.EH.05 Watatsumiite! Na2KMn2LiV2Si8O24 Cc m

Other Manganoneptunite Information

Help on References: References: 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 Manganoneptunite :
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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Dana No: Strunz No: 09.EH.05





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