Nchwaningite Mineral Data

Nchwaningite Mineral Data +

We specialise in top quality, fine minerals from Morocco, Namibia,
South Africa, Pakistan, Democratic Republic of Congo (ZaÃƒï¿½Ã‚Â¯re) and China
Worldwide Fine Minerals by B & C GOBIN

General Nchwaningite Information

Chemical Formula:

Mn++2SiO3(OH)2·(H2O)

Composition:

Molecular Weight = 237.99 gm

Manganese 46.17 % Mn 59.61 % MnO

Silicon 11.80 % Si 25.25 % SiO₂

Hydrogen 1.69 % H 15.14 % H₂O

Oxygen 40.34 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₂SiO₃(OH)₂·(H₂O)

Environment:

In a vug in manganese ore.

IMA Status:

Approved IMA 1995

Locality:

The N,chwaning II Mine, Kalahari Manganese Field, Northern Cape Province, Republic of South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for its locality.

Synonym:

ICSD 80118

IMA1994-002

PDF 47-1869

Search for Nchwaningite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Nchwaningite Crystallography

Axial Ratios:

a:b:c =1.7558:1:0.74

Cell Dimensions:

a = 12.672, b = 7.217, c = 5.341, Z = 4; V = 488.45 Den(Calc)= 3.24

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P ca2₁

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

By Intensity(I/I_o): 3.011(1), 2.456(0.8), 2.547(0.8),

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

Nyfeler D , Armbruster T , Dixon R , Bermanec V , American Mineralogist , 80 (1995) p.377-386, Nchwaningite, Mn2SiO3(OH)2.H2O, a new pyroxene-related chain silicate from the, N chwaning mine, Kalahari manganese field, South Africa

Physical Properties of Nchwaningite

Cleavage:

[100] Perfect, [010] Perfect

Color:

Light brown.

Density:

3.19

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Nchwaningite

Gladstone-Dale:

CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2118,KPDmeas= 0.2152,KC= 0.2214

Optical Data:

Biaxial (-), a=1.681, b=1.688, g=1.69, bire=0.0090, 2V(Calc)=56, 2V(Meas)=54.4.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Nchwaningite

Electron Density:

r_electron=3.11 gm/cc
note: r_Nchwaningite=3.19 gm/cc.

Fermion Index

Fermion Index = 0.0057
Boson Index = 0.9943

Photoelectric:

PE_Nchwaningite= 12.20 barns/electron
U=PE_Nchwaningite x r_electron= 37.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nchwaningite is Not Radioactive

Nchwaningite Classification

Dana Class:

65.1.8.1 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.8)Dana Group

65.1.8.1 Nchwaningite Mn2SiO3(OH)2·(H2O) P ca2₁ mm2

Strunz Class:

VIII/F.02-40 VIII - Silicates

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

VIII/F.02 - Pyroxene group, Orthopyroxene

VIII/F.02-10 Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m

VIII/F.02-20 Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m

VIII/F.02-30 Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m

VIII/F.02-40 Nchwaningite Mn2SiO3(OH)2·(H2O) P ca2₁ mm2

Other Nchwaningite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p377-386,1995) OPTIC PROP.(MinRec)

See Also:

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

Search for Nchwaningite using:

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

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

Translate Nchwaningite Mineral Data :

Ask about Nchwaningite 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 Nchwaningite Specimen Label here :

Nchwaningite

Mn++2SiO3(OH)2·(H2O)
Dana No: 65.1.8.1 Strunz No: VIII/F.02-40
Locality:

Notes: