Mindat Logo

Feitknechtite

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
mindat.org URL:http://www.mindat.org/min-1473.html
Please feel free to link to this page.

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)

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
 
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
Spanish:Feitknechtita

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

Search Engines:
  • Look for Feitknechtite on Google
  • Look for Feitknechtite images on Google
  • External Links:
  • Look for Feitknechtite on Webmineral
  • Look for Feitknechtite on Athena Mineralogy
  • Look for Feitknechtite on Wikipedia
  • Look for Feitknechtite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Feitknechtite in the Natural History Museum (London) online catalogue
  • Feitknechtite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Buy fine minerals and gemstones from Pala International
  • Rare and Unusual minerals at Mineralogical Research Company
  • Buy Fine Minerals from mineralsweb.com
  • Fabre Minerals - search for Feitknechtite specimens
  • Buy minerals from Mineralium.com
  • Buy from David K Joyce minerals
  • SpiriferMinerals.com - high quality specimens
  • Wilensky Fine Minerals
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Lapis Mineral Magazin
  • Find Feitknechtite on www.crystalclassics.co.uk
  • Search for - Feitknechtite - on e-Rocks Mineral Sales & Auctions
  • Jobs:
  • Mining & Geology Jobs
  • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    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.
    (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
    Yamada collection (Crystal World, Japan)
      • Tohoku Region
        • Iwate Prefecture
    Dr. Matsuo Nambu collection (curated at Geological Survey of Japan)
    Rocks & Min.:59:216.
    • Kyushu Island
      • 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
    • 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.
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 4th Nov 2009 12:58:05