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Nchwaningite Mineral Data

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General Nchwaningite Information

Help on Chemical  Formula: Chemical Formula: Mn++2SiO3(OH)2•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+2SiO3(OH)2•(H2O)
Help on Environment: Environment: In a vug in manganese ore.
Help on IMA Status: IMA Status: Approved IMA 1995
Help on Locality: Locality: The N,chwaning II Mine, Kalahari Manganese Field, Northern Cape Province, Republic of South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its locality.
Help on Name Pronunciation: Name Pronunciation: Nchwaningite + Pronunciation Say NCHWANINGITE
Help on Synonym: Synonym: ICSD 80118
  PDF 47-1869

Nchwaningite Image

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Comments: SEM image of acicular, platy nchwaningite crystals. (AmMin, v80:377).
Location: N'chwaning mine, Kalahari manganesefi eld, South Africa. Scale: See Image.
© American Mineralogist

Nchwaningite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7558:1:0.74
Help on Cell Dimensions: Cell Dimensions: a = 12.672, b = 7.217, c = 5.341, Z = 4; V = 488.45 Den(Calc)= 3.24
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P ca21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.011(1), 2.456(0.8), 2.547(0.8),

Physical Properties of Nchwaningite

Help on Cleavage: Cleavage: {100} Perfect, {010} Perfect
Help on Color: Color: Light brown.
Help on Density: Density: 3.19
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Nchwaningite

Help on Gladstone-Dale: 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
Ncalc = 1.71 - 1.72
Help on Optical Data: Optical Data: Biaxial (-), a=1.681, b=1.688, g=1.69, bire=0.0090, 2V(Calc)=56, 2V(Meas)=54.4.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Nchwaningite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Nchwaningite =3.19 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0057072871
Boson Index = 0.9942927129
Help on Photoelectric: Photoelectric: PENchwaningite = 12.20 barns/electron
U=PENchwaningite x rElectron Density= 37.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nchwaningite is Not Radioactive

Nchwaningite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.08)Dana Group Nchwaningite Mn2SiO3(OH)2•(H2O) P ca21 mm2
Help on  Strunz Class: Strunz Class: 09.DB.30 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DB -Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
09.DB.30 Nchwaningite Mn2SiO3(OH)2•(H2O) P ca21 mm2

Other Nchwaningite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p377-386,1995) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Nchwaningite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 09.DB.30





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