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Laurent-Guillaume de Koninck
Fe3+PO4 · 3H2O
Yellow; light yellow to ...
3½ - 4
Named by Giuseppe Cesàro in 1883 in honor of Laurent-Guillaume de Koninck (3 May 1809, Leuven, Belgium – 16 July 1887, Liège, Belgium), Professor at the University of Liège, Belgium. He identified hundreds of new paleontological Paleozoic species. He received the Wollaston medal in 1875.
This page provides mineralogical data about Koninckite.

Classification of Koninckite

Approved, 'Grandfathered' (first described prior to 1959)
First Published:

C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5

4 : (AB)5(XO4)2·xH2O

19 : Phosphates
14 : Phosphates of Fe and other metals

Physical Properties of Koninckite

Diaphaneity (Transparency):
Yellow; light yellow to colourless in transmitted light.
Hardness (Mohs):
3½ - 4
2.3 g/cm3 (Measured)    

Optical Data of Koninckite

RI values:
nα = 1.645 nβ = 1.656 nγ = 1.656
Max Birefringence:
δ = 0.011
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
relatively strong

Chemical Properties of Koninckite

Fe3+PO4 · 3H2O
Elements listed in formula:
Common Impurities:

Crystallography of Koninckite

Crystal System:
Cell Parameters:
a = 11.95 Å, c = 14.52 Å
a:c = 1 : 1.215
Unit Cell Volume:
V 2,073.49 ų (Calculated from Unit Cell)
Small spherical aggregates of radiating needles.
X-Ray Powder Diffraction Data:
8.42 (100)
5.99 (8)
4.48 (4)
3.85 (10)
3.77 (28)
2.98 (18)
2.83 (9)

Type Occurrence of Koninckite

Associated Minerals at Type Locality:

Relationship of Koninckite to other Species

8.CE.XBabánekiteCu3(AsO4)2 · 8H2O
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
8.CE.05GeigeriteMn52+(AsO4)2(HAsO4)2 · 10H2O
8.CE.10NewberyiteMg(HPO4) · 3H2O
8.CE.15BrassiteMg(HAsO4) · 4H2O
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2O
8.CE.20RößleriteMg(HAsO4) · 7H2O
8.CE.25MetaswitzeriteMn3(PO4)2 · 4H2O
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2O
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2O
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2O
8.CE.35BobierriteMg3(PO4)2 · 8H2O
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2O
8.CE.40ArupiteNi3(PO4)2 · 8H2O
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2O
8.CE.40ErythriteCo3(AsO4)2 · 8H2O
8.CE.40FerrisymplesiteFe33+(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2O
8.CE.40KöttigiteZn3(AsO4)2 · 8H2O
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
8.CE.40ParasymplesiteFe32+(AsO4)2 · 8H2O
8.CE.40VivianiteFe32+(PO4)2 · 8H2O
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2O
8.CE.45SymplesiteFe32+(AsO4)2 · 8H2O
8.CE.50CattiiteMg3(PO4)2 · 22H2O
8.CE.60KaňkiteFeAsO4 · 3.5H2O
8.CE.65SteigeriteAl(VO4) · 3H2O
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2O
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2O
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2O
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2O
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2O
8.CE.80SantabarbaraiteFe33+(PO4)2(OH)3 · 5H2O
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)
19.14.1CyriloviteNaFe33+(PO4)2(OH)4 · 2H2O
19.14.2KidwelliteNaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33
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
19.14.11UshkoviteMgFe23+(PO4)2(OH)2 · 8H2O
19.14.12Garyansellite(Mg,Fe)3(PO4)2(OH,O) · 1.5H2O
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
19.14.19DelvauxiteCaFe4(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
19.14.31Souzalite(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

Other Names for Koninckite

Name in Other Languages:
Simplified Chinese:针磷铁矿

Other Information

Other Information:
Readily soluble in hot HCl or HNO3.
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 Koninckite

Reference List:
Cesàro, G. (1883) Sur la koninckite, nouveau phosphate ferrique hydrate. Annales de la Société Géologique de Belgique: 11: 247-257. (in French)

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin: 679: 97.

Palache, C., Berman, H., Frondel, C.(1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 763.

Powder Diffraction File (International Center for Diffraction Data) 41-1489.

Van Tassel, R. (1968) Donnees cristallographiques sur la koninckite. Bulletin de la Société Française de Minéralogie et de Cristallographie: 91: 487-489.

Al'tgauzen, M.N. Kuznetsova, E.G. (1973) Nature of weathering in pyrite-bearing argillaceous shales. Litologiya i Poleznye Iskopaemye: 2: 41-49.

Leonardos, O.H., Fernandes, S.M., Fyfe, W.S., Powell, M. (1987) The micro-chemistry of uraniferous laterites from Brazil: A natural example of inorganic chromatography. Chemical Geology: 60: 111-119.

Van Der Meersche, E., De Paepe, P., Stoops, G. (2010) Minerals with Belgian Roots, from hopeite (1824) to tazieffite (2009). Academia Press, Gent for the Museum for the History of Sciences, 232 pages.

Plášil, J., Majzlan, J., Wierzbicka-Wieczorek, M., Kiefer, B. (2015) Crystal structure, thermal behaviour and parageneses of koninckite, FePO4·2.75H2O. Mineralogical Magazine: 79: 1159-1173.

Internet Links for Koninckite URL:
Please feel free to link to this page.
The following Koninckite specimens are currently listed for sale on

Localities for Koninckite

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.
(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.
  • Carinthia
    • Gailtaler Alpen & Karnische Alpen
      • Kirchbach
        • Oberbuchach
J. Mörtl: Carinthia II 192./112.:329-330 (2002)
      • Kötschach-Mauthen
        • Dellach
          • Würmlach
Pichler (2009)
  • Salzburg
    • Hohe Tauern
      • Untersulzbach valley
        • Leutachkopf - Stocker Alp area
Gröbner, J. & Kolitsch, U. (2008): 1532) Monazit-(Ce) und Rutil sowie ein neuerlicher Fund von Enargit von der Wieseggrinne am Leutachkopf im Untersulzbachtal. . P. 239 in Niedermayr et al. (2008): Neue Mineralfunde aus Österreich LVII. Carinthia II, 198./118., 223-274.
  • Styria
    • Leoben
Taucher, J. (2013): 1828) Koninckit und Woodhouseit vom Brandberg bei Leoben. Pp. 139-141 in Niedermayr, G. et al. (2013): Neue Mineralfunde aus Österreich LXII. Carinthia II, 203./123., 91-146.
Belgium (TL)
  • Liège Province
    • Visé
Ann.Mem.;Soc.géol.Belgique (1884) 11, 247; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 763.; R. Van Tassel, A.-M. Fransolet and K. Abraham (1979) Drugmanite, Pb2(Fe3+,Al)(PO4)2(OH) · H2O, a New Mineral from Richelle, Belgium. Mineralogical Magazine 1979 43:463-467
Czech Republic
  • Bohemia (Böhmen; Boehmen)
    • Pardubice Region
Jirásek, J.: Nález koninckitu u Litošic a jeho srovnání se světovými výskyty. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2005, roč. 13, s. 132-137.
  • North Rhine-Westphalia
    • Sauerland
      • Arnsberg
        • Uentrop
S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Sundern
        • Hellefeld
Wittern: "Mineralfundorte in Deutschland", 2001
  • Borsod-Abaúj-Zemplén Co.
    • Upponyi Mts
      • Dédestapolcsány
Koch: Minerals of Hungary, 1985
      • Nekézseny
Szakáll & Jánosi: Minerals of Hungary, 1995
  • Co. Limerick
    • Ardagh
Moreton, S. & Green, D.I. (2005) J. Russ. Soc., 8(2), p.78-80.
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Pietrasanta
          • Valdicastello Carducci
Senesi F., 2000. Koninckite e altri fosfati della miniera del Pollone (Valdicastello Carducci, Lucca). Riv. Miner. Ital., 1: 46-48.
  • Honshu Island
    • Chubu Region
      • Nagano Prefecture
        • Chino City
K. Sakurai, S. Matsubara & A. Kato (1987): Koninckite from Suwa Mine, Chino City, Nagano Prefecture, Japan. Bulletin of the National Science Museum, Series C (Geology & Paleontology), 13, 149–156; Sakurai et al (1991) Mineralogical Journal, 15, 261-267.
  • Osh Oblast
    • Turkestan Range
Daltry, Vaughn & Deliens, Michel (1994) The Type Mineralogy of Belgium . Annals of the Belgium Geological Society 116:15-28
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
  • Banská Bystrica Region
    • Rimavská Sobota Co.
Novák, F. et al. (2003): Koninckit, evansit, vashegyit a volborthit z Kocihy u Rimavské Soboty. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, roč. 11, s. 159-166.
  • Catalonia
    • Barcelona
      • Baix Llobregat
        • Gavà
Analyzed by XRD by Dr. Joan Vinals (Barcelona)- Col. Agustin Agudo Espinosa
Bareche, E (2005) "Els minerals de Catalunya. Segle XX" Ed. Grup Mineralògic Català, Barcelona, 269 p.
      • Vallès Occidental
        • Montcada i Reixac
Mineralogistes de Catalunya (1997), VII (1): 34-55
  • California
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Idria (New Idria)
Bradley, W.W. (1937), Thirty-third report of the State Mineralogist: California Division Mines Report 33: 251; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 313;
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