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Feitknechtite

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Big Photo

Noda-Tamagawa mine, Noda, Iwate Prefecture, Tohoku Region, Honshu Island, Japan
© Crystal Vine

Show Feitknechtite Photos (4)



Formula:
Mn
3+
 
O(OH)
System:TrigonalColour:lead grey, brownish black
This page provides mineralogical data about Feitknechtite.

Classification of Feitknechtite

IMA status:Approved
Strunz 8th edition ID:4/F.06-90
Nickel-Strunz 10th (pending) edition ID:4.FE.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
E : Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
Dana 8th edition ID:6.1.4.3

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
Hey's CIM Ref.:7.18.6

7 : Oxides and Hydroxides
18 : Oxides of Mn
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Type Occurrence of Feitknechtite

Type Locality:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Year of Discovery:1965

Physical Properties of Feitknechtite

Colour:lead grey, brownish black
Streak:brown

Crystallography of Feitknechtite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:P3m1 {P3 2/m 1}
Cell Parameters:a = 3.32Å, c = 4.71Å
Ratio:a:c = 1 : 1.419
Unit Cell Volume:V 44.96 ų (Calculated from Unit Cell)
Z:1
Morphology:Hexagonal platelets; granular, earthy.
Comment:Space group for synthetic material.
X-Ray Powder Diffraction:
d-spacingIntensity
4.62 (10)
2.64 (5)
2.36 (2b)
1.96 (2b)
1.55 (1)
1.50 (1)

Optical Data of Feitknechtite

Type:Uniaxial (-)
RI values: nω = 2.055 nε = 1.950
Maximum Birefringence:δ = 0.105

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High

Chemical Properties of Feitknechtite

Formula:
Mn
3+
 
O(OH)
Essential elements:H, Mn, O
All elements listed in formula:H, Mn, O

Relationship of Feitknechtite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FE.05Amakinite
(Fe
2+
 
,Mg)(OH)
 
2
4.FE.05Brucite
Mg(OH)
 
2
4.FE.05Portlandite
Ca(OH)
 
2
4.FE.05Pyrochroite
Mn(OH)
 
2
4.FE.05Theophrastite
Ni(OH)
 
2
4.FE.10Bayerite
Al(OH)
 
3
4.FE.10Doyleite
Al(OH)
 
3
4.FE.10Gibbsite
Al(OH)
 
3
4.FE.10Nordstrandite
Al(OH)
 
3
4.FE.15Böhmite
AlO(OH)
4.FE.15Lepidocrocite
γ-Fe
3+
 
O(OH)
4.FE.20Grimaldiite
CrO(OH)
4.FE.20Heterogenite
CoO(OH)
4.FE.25Lithiophorite
(Al,Li)MnO
 
2
(OH)
 
2
4.FE.30Quenselite
PbMnO
 
2
(OH)
4.FE.35Ferrihydrite
Fe
3+
5
O
 
3
(OH)
 
9
4.FE.40Feroxyhyte
Fe
3+
 
O(OH)
4.FE.40Vernadite
(Mn
4+
 
,Fe
3+
 
,Ca,Na)(O,OH)
 
2
 · nH
 
2
O
4.FE.45Quetzalcoatlite
Zn
 
6
Cu
 
3
(TeO
 
6
)
 
2
(OH)
 
6
 · Ag
 
x
Pb
 
y
Cl
 
x+2y
Related Minerals - Hey's Index Grouping:

- +
7.18.1Manganosite
MnO
7.18.2Hausmannite
MnMn
 
2
O
 
4
7.18.3Pyrolusite
MnO
 
2
7.18.4Ramsdellite
Mn
4+
 
O
 
2
7.18.5Akhtenskite
ε-Mn
4+
 
O
 
2
7.18.7Manganite
Mn
3+
 
O(OH)
7.18.8Groutite
Mn
3+
 
O(OH)
7.18.9Nsutite
(Mn
4+
 
,Mn
2+
 
)(O,OH)
 
2
7.18.10Pyrochroite
Mn(OH)
 
2
7.18.11Birnessite
(Na,Ca)
 
0.5
(Mn
4+
 
,Mn
3+
 
)
 
2
O
 
4
 · 1.5H
 
2
O
7.18.12Aurorite
(Mn
2+
 
,Ag,Ca)Mn
4+
3
O
 
7
 · 3H
 
2
O
7.18.13Cianciulliite
Mn(Mg,Mn)
 
2
Zn
 
2
(OH)
 
10
 · 2-4H
 
2
O

Other Names for Feitknechtite

Other Languages:
German:Feitknechtit
Simplified Chinese:六方水锰矿
Spanish:Feitknechtita
Traditional Chinese:六方水錳礦

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 Feitknechtite

Reference List:

- +
American Mineralogist: 50: 1296-1354.

Internet Links for Feitknechtite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Feitknechtite details from Handbook of Mineralogy (PDF)
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    • Localities for Feitknechtite

    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.
    Hide Locality List
    (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.
    Japan
     
    • Honshu Island
      • Chubu Region
        • Aichi Prefecture
          • Kita-Shidara-gun
            • Shidara-cho
    		Yamada collection (Crystal World, Japan)
        • Nagano Prefecture
          • Kami-Ina-gun
            • Hamayokokawa mine (Hamayokogawa mine)
    		Akira Kato (2011) Explanations of distributed specimens at the Ordinary Meeting of Mumeikai Group, No. 34 (January, 20011).
    Akira Kato (2011) Explanations of distributed specimens at the Ordinary Meeting of Mumeikai Group, No. 34 (January, 20011).
      • Kanto Region
        • Tochigi Prefecture
          • Kanuma City
    		Akira Kato (undated manuscript): Country rock and Minerals of the Kaso mine, Kanuma City, Tochigi Prefecture. (in japanese)
      • Kinki Region
        • Shiga Prefecture
          • Ritto-cho
    		Forrest Cureton specimens
      • Tohoku Region
        • Iwate Prefecture
          • Kuji City
            • Yamagata
    		Dr. Matsuo Nambu collection (curated at Geological Survey of Japan)
          • Noda
    		Rocks & Min.:59:216.
    • Kyushu Region
      • Oita prefecture
        • Tsukumi
    		Minerals Unlimited specimens (Ridgecrest, California)
    Mexico
     
    • Durango
      • Mun. de Mapimí
        • Mapimí
    		Mineralogical Record (2003) 34:5 The Ojuela Mine
    Panczner (1987): 191.
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
    		Minerals of South Africa
    Sweden
     
    • Dalarna
      • Hedemora
        • Garpenberg
    		(Kjell Gatedal)+ Grensman, F., Kalinowski, M.P. and Sandström, F. (2001): Garpenberg Norra. Litofilen. 18 (2), 26-46.
    • Värmland
      • Filipstad
    		Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
    • Västmanland
      • Hällefors
        • Grythyttan
    		No reference listed
    UK
     
    • Wales
      • Gwynedd (Caernarvonshire)
        • Lleyn Peninsula
          • Llanfaelrhys
            • Rhiw
    		UK Journal of mines & Minerals, number 29 pp47-48
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Franklin
    		Frondel, C.: Am. Min.:38:761-769 (1953); Wadsley, A.D.: Am. Min.:40:349-353 (1955); Dunn(1995):Pt4:591-592.
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