Corkite

Corkite
Classificazione Strunz (ed. 10)8.BL.05[1]
Formula chimicaPbFe3(P0,5S0,5O4)(OH)6[2]
Proprietà cristallografiche
Gruppo cristallinodimetrico
Sistema cristallinotrigonale[2]
Parametri di cellaa = 7,280 Å, c = 16,821 Å[3]
Gruppo puntuale3m
Gruppo spazialeR3m[2]
Proprietà fisiche
Densità misurata4,295[1] g/cm³
Densità calcolata4,31[1] g/cm³
Durezza (Mohs)3,5 - 4,5[1]
Sfaldaturaperfetta secondo {0001}[1]
Coloreda bruno a bruno giallastro chiaro, giallo pallido, da verde giallastro a verde scuro[1]
Lucentezzavitrea, subvitrea, resinosa, cerosa, grassa[1]
Opacitàtrasparente, traslucida[1]
Si invita a seguire lo schema di Modello di voce – Minerale

La corkite è un minerale appartenente al gruppo della beudantite descritto nel 1857[4] ma nominato solamente nel 1869.[5] Il nome deriva da quello della contea di Cork in Irlanda dove è stato scoperto.[1]

La corkite ha una composizione analoga a quella della beudantite con il fosforo in sostituzione dell'arsenico, formando una serie completa con essa. Forma una serie completa anche con l'hinsdalite con il ferro in sostituzione dell'alluminio. Forma una serie anche con la kintoreite.[1]

Morfologia

La corkite si rinviene solitamente in masse o croste, talvolta in cristalli romboedrici pseudocubici fino a 2 mm.[6]

Origine e giacitura

La corkite, analogamente ad altri minerali del gruppo, è un minerale secondario che si forma nelle zone di ossidazione dei giacimenti metallici basici di origine idrotermale.[1] Si rinviene associata con piromorfite, malachite, plumbojarosite, limonite e quarzo.[6]

Note

  1. ^ a b c d e f g h i j k (EN) Corkite, su mindat.org. URL consultato il 26 ottobre 2024.
  2. ^ a b c (EN) P. Bayliss, U. Kolitsch, E.H. Nickel e A. Pring, Alunite supergroup: recommended nomenclature (PDF), in Mineralogical Magazine, vol. 74, n. 5, ottobre 2010, pp. 919–927. URL consultato il 20 maggio 2013 (archiviato dall'url originale il 26 marzo 2012).
  3. ^ (EN) G. Giuseppe e C. Tadini, Corkite, PbFe3(SO4)(PO4)(OH)6, its crystal structure and ordered arrangement of the tetrahedral cations, in Neues Jahrbuch fur Mineralogie, Monatshefte, vol. 1987, 1987, pp. 71-81.
  4. ^ (DE) C. Rammelsberg, Ueber die Zusammensetzung des Beudantits (PDF), in Annalen der Physik und Chemie, vol. 10, 1857, pp. 581-583. URL consultato il 22 luglio 2013.
  5. ^ (FR) M. Adam, Tableau Minéralogique. Corkite (PDF), in Annales des Mines, vol. 15, 1869, pp. 552-553. URL consultato il 22 luglio 2013.
  6. ^ a b (EN) Corkite (PDF), in Handbook of Mineralogy, Mineralogical Society of America.

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