Koninckita

Infotaula de mineralKoninckita

Modifica el valor a Wikidata
Fórmula químicaFe3+PO₄·3H₂O
EpònimLaurent-Guillaume de Koninck Modifica el valor a Wikidata
Localitat tipusRichelle, Visé, Província de Lieja, Bèlgica
Classificació
Categoriafosfats
Nickel-Strunz 10a ed.8.CE.55
Nickel-Strunz 9a ed.8.CE.55 Modifica el valor a Wikidata
Nickel-Strunz 8a ed.VII/C.08 Modifica el valor a Wikidata
Dana40.4.2.1
Heys19.14.28
Propietats
Sistema cristal·lítetragonal
Estructura cristal·linaa = 11,95Å; c = 14,52Å;
Colorgroc; groc clar a incolor en llum transmessa (microscopi òptic)
Duresa (Mohs)3,5 a 4
Lluïssorvítria
Color de la ratllagroc
Diafanitattransparent
Densitat2,3 g/cm³ (mesurada);
Propietats òptiquesbiaxial
Índex de refracciónα = 1,645 nβ = 1,656 nγ = 1,656
Birefringènciaδ = 0,011
Dispersió òpticarelativament forta
Impureses comunesAl
Més informació
Estatus IMAmineral heretat (G) Modifica el valor a Wikidata
Any d'aprovació1884
SímbolKon Modifica el valor a Wikidata
Referències[1]

La koninckita és un mineral de la classe dels fosfats. Va ser anomenada per Giuseppe Cesàro l'any 1883 en honor de Laurent-Guillaume de Koninck, professor a la Universitat de Lieja. De Koninck va identificar centenars de noves espècies fòssils i va rebre la medalla de Wollaston l'any 1875.[1]

Característiques

La koninckita és un fosfat de fórmula química Fe3+PO₄·3H₂O. Cristal·litza en el sistema tetragonal. La seva duresa a l'escala de Mohs és 3,5 a 4. és soluble en HCl calent i en HNO₃.[1] Sol trobar-se en forma d'agregats formats per varis cristalls individuals o en hàbits esfèrics.[2]

Formació i jaciments

La konickita ha estat descrita només a Europa i als Estats Units.[1] A Catalunya s'ha descrit a les mines de Rocabruna (mina Elvira; Baix Llobregat) en un context de mineralitzacions de ferro.[3] També s'ha descrit a la pedrera del Turó de Montcada (Vallès Occidental), en materuials Silurico-devonians amb importants disseminacions i capes de fosfat.[4]

Referències

A Wikimedia Commons hi ha contingut multimèdia relatiu a: Koninckita
  1. ↑ 1,0 1,1 1,2 1,3 «Koninckite» (en anglès). Mindat. [Consulta: 7 novembre 2015].
  2. ↑ Barthelmy, Dave. «Koninckite Mineral Data». www.webmineral.com. [Consulta: 7 gener 2017].
  3. ↑ «Rocabruna Mines, Bruguers, Gavà, Baix Llobregat, Barcelona, Catalonia, Spain». www.mindat.org. [Consulta: 7 gener 2017].
  4. ↑ «Montcada hill quarry (Pedrera del Turó de Montcada), Montcada i Reixac, Vallès Occidental, Barcelona, Catalonia, Spain». www.mindat.org. [Consulta: 7 gener 2017].

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