Mangan-neptunite Mineral Data

Mangan-neptunite Mineral Data

General Mangan-neptunite Information

Chemical Formula:

KNa2Li(Mn,Fe++)2Ti2Si8O24

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

Empirical Formula:

KNa₂LiMn²⁺_1.5Fe²⁺_0.5Ti₂Si₈O₂₄

Environment:

Found in syenites and syenite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1923

Locality:

Lovozero Massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition and relationship to neptunite.

Mangan-neptunite Image

Images:

Mangan-neptunite

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

Images:

Mangan-neptunite Shkatulkalite

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

Mangan-neptunite Crystallography

Axial Ratios:

a:b:c =1.3125:1:0.802

Cell Dimensions:

a = 16.38, b = 12.48, c = 10.01, Z = 4; beta = 115.4° V = 1,848.47 Den(Calc)= 3.26

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 1.506(1), 2.485(1), 1.483(0.9),

Physical Properties of Mangan-neptunite

Color:

Red.

Density:

3.23

Diaphaniety:

Subopaque

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Mangan-neptunite

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

Optical Data:

Biaxial (+), a=1.697, b=1.7, g=1.725, bire=0.0280, 2V(Calc)=40, 2V(Meas)=36.

Calculated Properties of Mangan-neptunite

Electron Density:

r_electron=3.15 gm/cc
note: r_{Mangan-neptunite}=3.23 gm/cc.

Fermion Index

Fermion Index = 0.02666
Boson Index = 0.97334

Photoelectric:

PE_{Mangan-neptunite}= 6.43 barns/electron
U=PE_{Mangan-neptunite} x r_electron= 20.26 barns/cc.

Radioactivity:

GRapi = 60.70 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Mangan-neptunite - barely detectable

Mangan-neptunite Classification

Dana Class:

70.4.1.2 (70)Inosilicate Column or Tube Structures

(70.4)with linked chains forming cages

(70.4.1)Neptunite group

70.4.1.1 Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m

70.4.1.2 Mangan-neptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m

70.4.1.3 Watatsumiite! Na2KMn2LiV2Si8O24 Cc m

Strunz Class:

VIII/F.37-20 VIII - Silicates

VIII/F - Inosilicates (chain and band) complex chain structure. Cylindric chains and others

VIII/F.37 - Neptunite series

VIII/F.37-10 Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m

VIII/F.37-20 Mangan-neptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m

VIII/F.37-30 Watatsumiite! Na2KMn2LiV2Si8O24 Cc m

Other Mangan-neptunite Information

References:

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

See Also:

Links to other databases for Mangan-neptunite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Print or Cut-and-Paste your Mangan-neptunite Specimen Label here :

Mangan-neptunite

KNa2Li(Mn,Fe++)2Ti2Si8O24
Dana No: 70.4.1.2 Strunz No: VIII/F.37-20
Locality:

Notes: