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Nchwaningite

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Big Photo

N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
© Knut Eldjarn

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Formula:
Mn
2+
2
(SiO
 
3
)(OH)
 
2
 · H
 
2
O
System:OrthorhombicColour:Light brown
Lustre:VitreousHardness:5½
Name:After the type locality.
This page provides mineralogical data about Nchwaningite.

Classification of Nchwaningite

IMA status:Approved
Strunz 8th edition ID:8/F.02-40
Nickel-Strunz 10th (pending) edition ID:9.DB.30

9 : SILICATES (Germanates)
D : Inosilicates
B : Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
Dana 8th edition ID:65.1.8.1

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

Type Locality:N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
Year of Discovery:1995
Geological Setting of type material:vugs in Mn ore

Physical Properties of Nchwaningite

Lustre:Vitreous
Colour:Light brown
Streak:White
Hardness (Mohs):5½

Crystallography of Nchwaningite

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

Optical Data of Nchwaningite

Type:Biaxial (-)
RI values: nα = 1.681 nβ = 1.688 nγ = 1.690
2V:Measured: 54° , Calculated: 56°
Maximum Birefringence:δ = 0.009

Chart 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 Nchwaningite

Formula:
Mn
2+
2
(SiO
 
3
)(OH)
 
2
 · H
 
2
O
Essential elements:H, Mn, O, Si
All elements listed in formula:H, Mn, O, Si
Common Impurities:Al,Fe,Mg,Ca

Relationship of Nchwaningite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DB.05Balipholite
BaLiMg
 
2
Al
 
3
(Si
 
2
O
 
6
)
 
2
(OH)
 
4
9.DB.05Carpholite
Mn
2+
 
Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Magnesiocarpholite
(Mg,Fe
2+
 
)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Potassiccarpholite
(K,☐)(Li,Mn
2+
 
)
 
2
Al
 
4
(Si
 
2
O
 
6
)
 
2
(OH,F)
 
8
9.DB.05Vanadiocarpholite
Mn
2+
 
V
3+
 
Al(Si
 
2
O
 
6
)(OH)
 
4
9.DB.10Lorenzenite
Na
 
2
Ti
 
2
(Si
 
2
O
 
6
)O
 
3
9.DB.15Lintisite
LiNa
 
3
Ti
 
2
(Si
 
2
O
 
6
)
 
2
O
 
2
 · 2H
 
2
O
9.DB.15Punkaruaivite
LiTi
 
2
(HSi
 
4
O
 
12
)(OH)
 
2
 · H
 
2
O
9.DB.17Eliseevite
LiNa
 
1.5
Ti
 
2
(H
 
1.5
Si
 
4
O
 
12
)O
 
2
 · 2H
 
2
O
9.DB.20Kukisvumite
Na
 
6
ZnTi
 
4
(Si
 
8
O
 
24
)O
 
4
 · 4H
 
2
O
9.DB.20Manganokukisvumite
Na
 
6
MnTi
 
4
(Si
 
8
O
 
24
)O
 
4
 · 4H
 
2
O
9.DB.25Vinogradovite
(Na,Ca,K)
 
4
Ti
 
4
AlSi
 
6
O
 
23
(OH) · 2H
 
2
O
9.DB.25Paravinogradovite
Na
 
1-2
(Ti,Fe
3+
 
)
 
4
(Si
 
2
O
 
6
)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
4
 · H
 
2
O
9.DB.35Plancheite
Cu
 
8
(Si
 
8
O
 
22
)(OH)
 
4
 · H
 
2
O
9.DB.40Shattuckite
Cu
 
5
(Si
 
2
O
 
6
)
 
2
(OH)
 
2
9.DB.40UM2005-31-SiO:CuH
Cu
 
11
(SiO
 
4
)(OH)
 
18
 · 9H
 
2
O ?
9.DB.45Aerinite
(Ca
 
5.1
Na
 
0.5
)(Fe
3+
 
,Al,Fe
2+
 
,Mg)
 
4
(Al,Mg)
 
6
[HSi
 
12
O
 
36
(OH)
 
12
][(CO
 
3
)
 
1.2
(H
 
2
O)
 
12
]
9.DB.50Capranicaite
KCaNaAl
 
4
B
 
4
Si
 
2
O
 
18

Other Names for Nchwaningite

Synonyms:
IMA1994-002
Other Languages:
German:Nchwaningit
Russian:Нчванингит
Spanish:Nchwaningita

Other Information

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

References for Nchwaningite

Reference List:

- +
Mineralogical Record: 27: 203-204.

American Mineralogist (1995): 80: 377-386.

Internet Links for Nchwaningite

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    • Localities for Nchwaningite

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
        • Hotazel
    		No reference listed
        • Kuruman
          • N'Chwaning Mines
    		[Amer.Min.(1995) 80, 377-386; MinRec 27:203-204]
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