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Kidwellite

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Albert Lewis Kidwell
Formula:
NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33
Formula is slightly simplified; for details see Kolitsch (2004).
System:
Monoclinic
Colour:
Greenish yellow, ...
Hardness:
3
Name:
Named by Paul (Paulus) B. Moore and Jum Ito in 1978 in honor of Albert Lewis (or Laws) Kidwell (January 1, 1919 Auxvasse, Missouri, USA - August 16, 2008 Scottsdale, Arizona, USA), mineral collector and research geologist with Carter Oil Company and later Exxon Oil Company, Houston, Texas, USA.
Occurs as replacement of rockbridgeite and beraunite.
Dufrénite or natrodufrénite may overgrow, in an epitaxial way, kidwellite, and vice-versa.

May be confused with meurigite-Na.

Classification of Kidwellite

Approved 1974
7/D.11-140
8.DK.20

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
Dana 7th ed.:
42.8.2.1
42.8.2.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : (AB)5(XO4)3Zq·xH2O
19.14.2

19 : Phosphates
14 : Phosphates of Fe and other metals
mindat.org URL:
http://www.mindat.org/min-2202.html
Please feel free to link to this page.

First Recorded Occurrence of Kidwellite

General Appearance of First Recorded Material:
Olive green botryoids or bands within other phosphate mineral botryoids.
Geological Setting of First Recorded Material:
Phosphate-bearing iron deposits
Associated Minerals at First Recorded Locality:

Occurrences of Kidwellite

Geological Setting:
Rarely in phosphate-rich granite pegmatites

Physical Properties of Kidwellite

Resinous, Waxy, Silky, Dull
Comment:
Frequently matte botryoids with a fine velvety surface
Colour:
Greenish yellow, Greenish white, Yellow, Light green
Streak:
yellow
Hardness (Mohs):
3
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {100}
Fracture:
Splintery
Density:
3.04 - 3.3 g/cm3 (Measured)    3.34 g/cm3 (Calculated)

Crystallography of Kidwellite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Space Group Setting:
P2/c
Cell Parameters:
a = 20.117Å, b = 5.185Å, c = 13.978Å
β = 107.07°
Ratio:
a:b:c = 3.88 : 1 : 2.696
Unit Cell Volume:
V 1,393.77 ų (Calculated from Unit Cell)
Morphology:
Usually acicular, but may rarely form almost rod-like crystals.
Comment:
Single-crystal data; slightly As-bearing.
X-Ray Powder Diffraction Data:
d-spacingIntensity
9.41 (100)
6.43 (30)
4.017 (35)
3.813 (40)
3.413 (55)
3.193 (40)
3.173 (35)

Optical Data of Kidwellite

Type:
Biaxial (-)
RI values:
nα = 1.787 nβ = 1.800 nγ = 1.805
Birefringence:
0.018
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
extreme
Pleochroism:
Non-pleochroic

Chemical Properties of Kidwellite

Formula:
NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33

Formula is slightly simplified; for details see Kolitsch (2004).
Essential elements:
All elements listed in formula:

Relationship of Kidwellite to other Species

8.DK.RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2O
8.DK.10BariopharmacosideriteBa0.5Fe43+(AsO4)3(OH)4 · 5H2O
8.DK.10PharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
8.DK.10Natropharmacosiderite(Na,K)Fe43+(AsO4)3(OH)4 · 6-7H2O
8.DK.10Hydroniumpharmacosiderite(H3O)Fe4(AsO4)3(OH)4 · 4H2O
8.DK.12PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2O
8.DK.12NatropharmacoalumiteNaAl4(AsO4)3(OH)4 · 4H2O
8.DK.12BariopharmacoalumiteBa0.5Al4(AsO4)3(OH)4 · 4H2O
8.DK.15BurangaiteNaFe2+Al5(PO4)4(OH)6 · 2H2O
8.DK.15DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
8.DK.15NatrodufréniteNaFe2+Fe53+(PO4)4(OH)6 · 2H2O
8.DK.15MatioliiteNaMgAl5(PO4)4(OH)6 · 2H2O
8.DK.15GayiteNaMn2+Fe53+(PO4)4(OH)6 · 2H2O
8.DK.25Bleasdaleite(Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13
8.DK.30Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
8.DK.35KrasnoviteBa(Al,Mg)(PO4,CO3)(OH)2 · H2O
19.14.1CyriloviteNaFe33+(PO4)2(OH)4 · 2H2O
19.14.3Rosemaryite(Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3
19.14.4Wyllieite(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3
19.14.5Ferrowyllieite(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3
19.14.6NatrodufréniteNaFe2+Fe53+(PO4)4(OH)6 · 2H2O
19.14.7LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
19.14.8Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O
19.14.9BurangaiteNaFe2+Al5(PO4)4(OH)6 · 2H2O
19.14.10Satterlyite(Fe2+,Mg,Fe3+)2(PO4)(OH,O)
19.14.11UshkoviteMgFe23+(PO4)2(OH)2 · 8H2O
19.14.12Garyansellite(Mg,Fe)3(PO4)2(OH,O) · 1.5H2O
19.14.13ThadeuiteCa(Mg,Fe2+)3(PO4)2(OH,F)2
19.14.14AnapaiteCa2Fe2+(PO4)2 · 4H2O
19.14.15XanthoxeniteCa4Fe23+(PO4)4(OH)2 · 3H2O
19.14.16CalcioferriteCa2Fe23+(PO4)3(OH) · 7H2O
19.14.17MitridatiteCa2Fe33+(PO4)3O2 · 3H2O
19.14.18MélonjosephiteCaFe2+Fe3+(PO4)2(OH)
19.14.19DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed ·
19.14.20CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
19.14.21SegeleriteCa2 Mg2 Fe23+(PO4)4(OH)2 · 8H2O
19.14.22KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2O
19.14.23VauxiteFe2+Al2(PO4)2(OH)2 · 6H2O
19.14.24MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
19.14.25ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
19.14.26SigloiteFe3+Al2(PO4)2(OH)3 · 7H2O
19.14.27CacoxeniteFe243+Al(PO4)17O6(OH)12 · 17H2O
19.14.28KoninckiteFe3+PO4 · 3H2O
19.14.29Lazulite(Mg,Fe2+)Al2(PO4)2(OH)2
19.14.30ScorzaliteFe2+Al2(PO4)2(OH)2
19.14.31Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
19.14.32Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
19.14.33ZaïriteBiFe33+(PO4)2(OH)6

Other Names for Kidwellite

Name in Other Languages:
German:Kidwellit
Spanish:Kidwelita

Other Information

Not fluorescent in UV
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 Kidwellite

Reference List:
Moore, P.B. & Ito, J. (1978): Kidwellite, NaFe3+9(OH)10(PO4)6*5H2O, a new species. Mineralogical Magazine,42, 137-140.

American Mineralogist (1979): 64: 242-243.

Braithwaite, R.S.W. and Corke, H. (1980) Kidwellite from Cornwall. Mineralogical Magazine, 43, 952-953.

Kolitsch, U. (2004): The crystal structures kidwellite and 'laubmannite', two complex fibrous iron phosphates. Mineralogical Magazine, 68, 147-165.

Internet Links for Kidwellite

Localities for Kidwellite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Australia
 
  • New South Wales
    • Yancowinna Co.
      • Broken Hill
Australian Min. 3:1 (1997)
  • South Australia
    • Eyre Peninsula
      • Middleback Range
        • Iron Knob
Min Rec 12:106n, 22:(387)
  • Victoria
    • Buloke Shire
      • Wycheproof
W.D.Birch. Phosphate Minerals of Victoria. The Mineralogical Society of Victoria special publication No. 3 pp. 28-32 W.D.Birch 1996.Portlandite and other recent mineral discoveries in the granite at Lake Boga, Wycheproof and Pyramid Hill, Victoria.Australian Journal of Mineralogy Vol.2 No.2, Dec.1996
    • Swan Hill Rural City
      • Lake Boga
W.D. Birch & D.A.Henry 1993. Phosphate Minerals of Victoria, The Mineralogical Society of Victoria special publication No. 3, pp. 14-27
Brazil
 
  • Minas Gerais
    • Doce valley
      • Galiléia
        • Sapucaia do Norte
Cassedanne, J.P. & Baptista, A. (1999): Famous Mineral Localities: The Sapucaia Pegmatite Minas Gerais, Brazil. Mineralogical Record, 30: 347-360 + 365
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Plzeň Region
      • Rokycany (Rokitzan; Rokytzan)
Janouš, F.: Minerály z Kněží hory u Těškova (okres Rokycany), Minerál, 1995, roč. 3, č. 6, s. 367-369.
France
 
  • Auvergne
    • Allier
      • Ébreuil
        • Échassières
Queneau Patrice collection; Uwe Kolitsch (PXRD analysis)
Pierre Le Roch & Jean-Marc Johannet collections
Walenta, K. & Binder, W. (1980): Kidwellit und Dufrenit aus den Mines de Montmins bei Echassiéres (französisches Zentralmassiv). Aufschluss 31, 51-54.; Le Règne Minéral, (33), 5-25.
  • Midi-Pyrénées
    • Tarn
      • Castelnau-de-Brassac
        • Fumade
Queneau Patrice collection
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German); MinRec 28:141; U. Kolitsch (2004): The crystal structures of kidwellite and 'laubmannite', two complex fibrous iron phosphates. Mineral. Mag. 68, 147-165.
  • Hesse
    • Limburg
      • Mensfelden
http://taunusmineralien.de/Stbr.Birkenkopf.html
    • Wetzlar
      • Waldgirmes
Weiss: "Mineralfundstellen, Deutschland West", 1990
      • Weilburg
        • Essershausen
Blaß, G. (2002): Eine neue Phosphatmineralien-Paragenese von der Grube Mark bei Essershausen, mittleres Lahngebiet, Taunus. Mineralien-Welt, 13 (6), 18-43. (in German)
  • North Rhine-Westphalia
    • Sauerland
      • Warstein
        • Hirschberg
D. Pawlowski: "Mineralfundstellen im Sauerland", Weise (Munich), 1991
  • Rhineland-Palatinate
    • Siegerland
      • Herdorf
        • Dermbach
Hucko, S. (2010): Phosphatparagenesen auf Brauneisensteingängen am Windhahn. Mineralien-Welt 21 (2), 14-25.
    • Westerwald
      • Bad Marienberg
        • Wildsachsen
S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Wied Iron Spar District
        • Altenkirchen
          • Bürdenbach
Weiss: "Mineralienfundstellen, Deutschland West", Weise (Munich), 1990
        • Neuwied
          • Dernbach
Belendorff, K. (2012) Neuigkeiten von der Grube Schöne Aussicht bei Dernbach. Mineralienwelt, 23(5), 28-37.
  • Saxony
    • Oberlausitz
      • Görlitz
        • Rengersdorf
T. Witzke & T. Giesler (1997): Neufunde aus Sachsen (VI): Churchit-(Y), Cyrilovit, Faustit, Kidwellit, Meurigit und Nickelhexahydrit aus der Lausitz.- Lapis 22, 9, 36-38
Japan
 
  • Honshu Island
    • Kanto Region
      • Ibaraki Prefecture
        • Kasumigaura City
          • Chiyoda-machi
Matsubara & Kato (1980) Koubutsugaku Zasshi, 14, 269-286.
Mali
 
  • Sikasso Region
Gineste, C. (2012): N'golokasso, une occurrence de phosphates dans le Sud Mali. Le Cahier des Micromonteurs, 3-2012, 110-120
Morocco
 
  • Souss-Massa-Draâ Region
    • Ouarzazate Province
      • Tazenakht
Favreau, G. (2012): Les minéralisations à phosphates de la pegmatite d'Angarf-Sud (Maroc).Le Cahier des Micromonteurs, 3-2012, 3-70.
Namibia
 
  • Erongo Region
    • Karibib District
      • Okatjimukuju Farm 55 (Friedrichsfelde Farm)
P. Keller and O. von Knorring, Eur. J. Mineral. , 1989, 1, pp. 567-593.
      • Usakos
Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern. 409 (in English).
Der Aufschluss 36:117-119
Portugal
 
  • Bragança District
    • Torre de Moncorvo
      • Felgar
Pedro Alves collection
Pedro Alves collection
  • Guarda District
    • Gouveia
Georges Favreau info; Analyses by Nicolas Meisser in Lausanne (EDS + XRD).
desescaut.jy@voila.fr
Spain
 
  • Castile-La Mancha
    • Ciudad Real
      • Minas de Horcajo
Sáinz de Baranda, B., Palero, F.J., García, G. (2004): El Horcajo, las piromorfitas más famosas del mundo. Bocamina, 13, 32-68.
  • Extremadura
    • Cáceres
      • Zarza la Mayor
Viñals, J. and Calvo, M. (2011). Secondary phosphates of La Paloma mine, Zarza la Mayor, Cáceres, Spain. Mineral Up 2 (5), 8-31.
Sweden
 
  • Lappland
    • Kiruna district
      • Svappavaara
Bjällerud, C.-G. (1989): Phosphate minerals from the Leveäniemi Iron Mine, Svappavaara, Sweden. Mineralogical Record. 20 (5):343-346
UK
 
  • England
    • Cornwall
      • Liskeard District
        • Linkinhorne
          • Minions
Mineralogical Magazine, 43, 952-953; Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
USA
 
  • Alabama
    • Calhoun Co.
Min Rec 1995 26:475-499
    • Cherokee Co.
Barwood, H. & Hajek, B. (1978): Notes of Some New Occurences in Alabama. Mineralogical Record. 9: 388-391; Min.Rec.:20(5):361; Rocks & Min.: 64:203.
Mineralogy of Alabama Geol Surv Ala. Bull 120
Rocks & Min 70:5 pp 320-333
  • Arkansas
    • Montgomery Co.
      • Norman
Mineralogical Magazine 1978 42 : 137-140.; Rocks & Minerals: 64: 297.
      • North Mountain
Rocks & Min.: 63:113; 64:294; Sick (1984).
    • Polk Co.
Rocks and Minerals, (1988) 63:104-125
      • Shady
Rocks & Min.:64:297-298.
Rocks and Minerals, (1988) 63:104-125
      • Three Oaks Gap
Rocks & Minerals: 63: 120.
  • Georgia
    • Burke Co.
      • Girard District
Jason Smith & M.E. Ciriotti (2005) [m.ciriotti@tin.it]
  • Nevada
    • Esmeralda Co.
NBMG Spec. Pub. 31 Minerals of Nevada
      • Divide District
NBMG Spec. Pub. 31 Minerals of Nevada
    • Humboldt Co.
      • Iron Point District
        • Valmy
Dr. William S. Wise presentation to Northwest Micro Mineral Study Group on 1 May 2004, Update on Mineralogy of the Silver Coin Mine, Iron Point District, Edna Mountains, Humboldt Co., Nevada
NBMG Spec. Pub. 31 Minerals of Nevada
  • South Dakota
    • Custer Co.
      • Custer District
        • Fourmile
Thomas J. Campbell & Willard L. Roberts (1986) Phosphate Minerals from the Tip Top Mine, Black Hills, South Dakota. Min. Rec. 17: 237-254.
    • Pennington Co.
      • Keystone District
        • Glendale
Rocks & Minerals: 60: 116.
  • Virginia
    • Rockbridge Co.
Minerals of Virginia, 1990 by R. V. Dietrich
      • Lyndhurst-Vesuvius District
Rocks & Min.:64:42-45 (also see Rocks & Min.:57:20-22 & 60:168); Watson(1907).
      • Midvale
        • South Mountain
Rocks & Min.: 57:20 & 60:168.
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