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Nchwaningite

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Formula:
Mn2+2(SiO3)(OH)2 · H2O
Colour:
Light brown
Lustre:
Vitreous
Hardness:
Crystal System:
Orthorhombic
Name:
After the type locality.
This page provides mineralogical data about Nchwaningite.


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Classification of NchwaningiteHide

Approved
9.DB.30

9 : SILICATES (Germanates)
D : Inosilicates
B : Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
65.1.8.1

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2

Physical Properties of NchwaningiteHide

Vitreous
Colour:
Light brown
Streak:
White
Hardness:
5½ on Mohs scale

Optical Data of NchwaningiteHide

Type:
Biaxial (-)
RI values:
nα = 1.681 nβ = 1.688 nγ = 1.690
2V:
Measured: 54° , Calculated: 56°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak to distinct

Chemical Properties of NchwaningiteHide

Formula:
Mn2+2(SiO3)(OH)2 · H2O
IMA Formula:
Mn2SiO3(OH)2 · H2O
Common Impurities:
Al,Fe,Mg,Ca

Crystallography of NchwaningiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 12.67 Å, b = 7.21 Å, c = 5.34 Å
Ratio:
a:b:c = 1.757 : 1 : 0.741
Unit Cell V:
487.81 ų (Calculated from Unit Cell)

Type Occurrence of NchwaningiteHide

Synonyms of NchwaningiteHide

Other Language Names for NchwaningiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite1 photo of Nchwaningite associated with Calcite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DB.05BalipholiteBaLiMg2Al3(Si2O6)2(OH)4Orth.
9.DB.05CarpholiteMn2+Al2(Si2O6)(OH)4Orth.
9.DB.05Ferrocarpholite(Fe2+,Mg)Al2(Si2O6)(OH)4Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.05Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4Orth.
9.DB.05Potassiccarpholite(K,☐)(Li,Mn2+)2Al4(Si2O6)2(OH,F)8Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.05VanadiocarpholiteMn2+V3+Al(Si2O6)(OH)4Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.10LorenzeniteNa2Ti2(Si2O6)O3Orth. mmm (2/m 2/m 2/m) : Pbcn
9.DB.15LintisiteLiNa3Ti2(Si2O6)2O2 · 2H2OMon.
9.DB.15PunkaruaiviteLiTi2(HSi4O12)(OH)2 · H2OMon. 2/m : B2/b
9.DB.17EliseeviteLiNa1.5Ti2(H1.5Si4O12)O2 · 2H2OMon. 2/m : B2/b
9.DB.20KukisvumiteNa6ZnTi4(Si8O24)O4 · 4H2OOrth.
9.DB.20ManganokukisvumiteNa6MnTi4(Si8O24)O4 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pccn
9.DB.25VinogradoviteNa4Ti4(Si2O6)2[(Si,Al)4O10]O4 · (H2O,Na,K)3Mon. 2/m : B2/b
9.DB.25ParavinogradoviteNa1-2(Ti,Fe3+)4(Si2O6)2(AlSi3O10)(OH)4 · H2OTric. 1 : P1
9.DB.35PlancheiteCu8(Si8O22)(OH)4 · H2OOrth. mmm (2/m 2/m 2/m)
9.DB.40ShattuckiteCu5(Si2O6)2(OH)2Orth. mmm (2/m 2/m 2/m)
9.DB.40UM2005-31-SiO:CuHCu11(SiO4)(OH)18 · 9H2O ?
9.DB.45Aerinite(Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO3)1.2(H2O)12]Mon.
9.DB.50CapranicaiteKCaNaAl4B4Si2O18Mon. 2/m : P21/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for NchwaningiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Record: 27: 203-204.
American Mineralogist (1995): 80: 377-386.

Internet Links for NchwaningiteHide

Localities for NchwaningiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
Nyfeler, D., Armbruster, T., Dixon, R., & Bermanec, V. (1995). Nchwaningite, Mn2SiO3 (OH) 2H2O, a new pyroxene-related chain silicate from the N’chwaning mine, Kalahari manganese field, South Africa. Am Mineral, 80, 377-386.
      • Kuruman
        • N'Chwaning Mines
[Amer.Min.(1995) 80, 377-386; MinRec 27:203-204]
Mineral and/or Locality  
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