Namansilite Mineral Data

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General Namansilite Information

Chemical Formula:

NaMn+++(Si2O6)

Composition:

Molecular Weight = 230.10 gm

Sodium 9.99 % Na 13.47 % Na₂O

Manganese 23.88 % Mn 34.31 % Mn₂O₃

Silicon 24.41 % Si 52.23 % SiO₂

Oxygen 41.72 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaMn³⁺Si₂O₆

Environment:

In low-grade metamorphosed and highly oxidized Mn, Na-rich sediments.

IMA Status:

Approved IMA 1992

Locality:

From the Irnimi deposit, Taikan Mountains, Khabarovsk Territory, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the sodium, NAtrium; MANganese; and SILicon in the formula.

Name Pronunciation:

Namansilite + Pronunciation

Synonym:

IMA1989-026

Namansilite Image

Images:

Namansilite

Comments: Dark red namansilite veinlets in rock (slabbed specimen).
Location: Woods mine, near Tamworth, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Namansilite Crystallography

Axial Ratios:

a:b:c =1.1042:1:0.6217

Cell Dimensions:

a = 9.513, b = 8.615, c = 5.356, Z = 4; beta = 105.12° V = 423.75 Den(Calc)= 3.61

Crystal System:

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

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

By Intensity(I/I_o): 2.584(1), 2.501(0.9), 2.927(0.9),

Crystal Structure:

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Ohashi H , Osawa T , Tsukimura K , Acta Crystallographica, Section C , 43 (1987) p.605-607, Refinement of the structure of manganese sodium dimetasilicate, Locality: synthetic, Note: pyroxene, Note: anisoB s from ICSD

Physical Properties of Namansilite

Cleavage:

{???} Perfect

Color:

Brownish red, Violet red.

Density:

3.6

Diaphaneity:

Transparent

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous - Pearly

Streak:

brown red

Optical Properties of Namansilite

Gladstone-Dale:

CI meas= 0.083 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2172,KPDmeas= 0.2178,KC= 0.2375
Ncalc = 1.85 - 1.86

Optical Data:

Biaxial (-), a=1.746, b=1.769, g=1.837, bire=0.0910, 2V(Calc)=64, 2V(Meas)=15-20.

Calculated Properties of Namansilite

Electron Density:

Bulk Density (Electron Density)=3.50 gm/cc
note: Specific Gravity of Namansilite =3.60 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Namansilite= 7.18 barns/electron
U=PE_Namansilite x rElectron Density= 25.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Namansilite is Not Radioactive

Namansilite Classification

Dana Class:

65.01.03c.03 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.01)with chains P=2

(65.01.03c)C2/c clinopyroxenes (Na clinopyroxenes)

65.01.03c.01 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

65.01.03c.02 Aegirine NaFeSi2O6 C 2/c 2/m

65.01.03c.03 Namansilite NaMn(Si2O6) C 2/c 2/m

65.01.03c.04 Kosmochlor NaCrSi2O6 C 2/c 2/m

65.01.03c.05 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

65.01.03c.06 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

Strunz Class:

09.DA.25 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family

09.DA.25 Aegirine NaFeSi2O6 C 2/c 2/m

09.DA.25 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

09.DA.25 Kosmochlor NaCrSi2O6 C 2/c 2/m

09.DA.25 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

09.DA.25 Namansilite NaMn(Si2O6) C 2/c 2/m

09.DA.25 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

Other Namansilite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.78,p1316,1993) OPTIC PROP.(Am.Min.,Vol.78,p1316,1993)

See Also:

Links to other databases for Namansilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Namansilite Specimen Label here :

Namansilite

NaMn+++(Si2O6)
Dana No: 65.01.03c.03 Strunz No: 09.DA.25
Locality:

Notes: