Namansilite Mineral Data

Namansilite Mineral Data +

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

IMA Status:

Approved IMA 1992

Locality:

Link to MinDat.org Location Data.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaniety:

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

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:

r_electron=3.50 gm/cc
note: r_Namansilite=3.60 gm/cc.

Fermion Index

Fermion Index = 0.0116
Boson Index = 0.9884

Photoelectric:

PE_Namansilite= 7.18 barns/electron
U=PE_Namansilite x r_electron= 25.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Namansilite is Not Radioactive

Namansilite Classification

Dana Class:

65.1.3c.3 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.3c)C2/c clinopyroxenes (Na clinopyroxenes)

65.1.3c.1 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

65.1.3c.2 Aegirine NaFeSi2O6 C 2/c 2/m

65.1.3c.3 Namansilite NaMn(Si2O6) C 2/c 2/m

65.1.3c.4 Kosmochlor NaCrSi2O6 C 2/c 2/m

65.1.3c.5 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

65.1.3c.6 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

Strunz Class:

VIII/F.01-145 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-

VIII/F.01 - Pyroxene group, Clinopyroxene

VIII/F.01-10 Clinoenstatite Mg2Si2O6 P 2₁/c 2/m

VIII/F.01-20 Clinoferrosilite (Fe,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-30 Kanoite (Mn,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-40 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 2₁/c 2/m

VIII/F.01-50 Diopside CaMgSi2O6 C 2/c 2/m

VIII/F.01-60 Hedenbergite CaFeSi2O6 C 2/c 2/m

VIII/F.01-70 Johannsenite CaMnSi2O6 C 2/c 2/m

VIII/F.01-80 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

VIII/F.01-90 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

VIII/F.01-100 Omphacite (Ca,Na)(Mg,Fe,Al)Si2O6 P 2/n 2/m

VIII/F.01-110 Esseneite CaFeAlSiO6 C 2/c 2/m

VIII/F.01-120 Spodumene LiAlSi2O6 C 2/c 2/m

VIII/F.01-130 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

VIII/F.01-140 Aegirine NaFeSi2O6 C 2/c 2/m

VIII/F.01-145 Namansilite NaMn(Si2O6) C 2/c 2/m

VIII/F.01-150 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

VIII/F.01-160 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

VIII/F.01-170 Kosmochlor NaCrSi2O6 C 2/c 2/m

Other Namansilite Information

References:

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

Search for Namansilite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Namansilite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Namansilite Mineral Data :

Ask about Namansilite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Namansilite

NaMn+++(Si2O6)
Dana No: 65.1.3c.3 Strunz No: VIII/F.01-145
Locality:

Notes: