Phosphohedyphane

Phosphohedyphane
Catégorie VIII : phosphates, arséniates, vanadates[1]
Image illustrative de l’article Phosphohedyphane
Phosphohedyphane, Mine de Saint-Salvy, France (15x13 cm)
Général
Classe de Strunz
Formule chimique (Pb,Ca)5(PO4)3Cl
Identification
Masse formulaire 1068,23 gm uma
Couleur blanc, incolore, verdâtre à jaunâtre
Système cristallin hexagonal
Réseau de Bravais primitif P
Classe cristalline et groupe d'espace dipyramidale ;
P 63/m
Macle possible
Clivage jamais observé
Cassure irrégulière à subconchoïdale
Habitus massif, botryoïdal, prismatique en petits cristaux de 0,5 à 0,1 mm
Trait blanc
Éclat vitraux à gras
Propriétés optiques
Indice de réfraction e=1,928,
w=1,935
Biréfringence Uniaxe (-) ; δ = 0,0070
Fluorescence ultraviolet aucune
Transparence transparent à translucide
Propriétés chimiques
Densité 5,92
Propriétés physiques
Magnétisme aucun
Radioactivité aucune

Unités du SI & CNTP, sauf indication contraire.

La phosphohedyphane est une espèce minérale composée de chloro-phosphate anhydre de plomb et de calcium. Il fait partie du groupe de l’apatite. Ce nouveau minéral est en fait la reconnaissance de la polysphaerite qui jusqu’alors avait été considérée comme une simple variété de pyromorphite.

Historique de la description et appellations

Inventeur et étymologie

Décrit par Kampf, A.R., I.M. Steele, & R.A. Jenkins (2006), le nom dérive du minéral hedyphane et de la composition chimique[2].

Topotype

Gisement
Mine Capitana, Province de Copiapó, Région d'Atacama, Chili.
Échantillons
Le spécimen type est déposé au Natural History Museum of Los Angeles County.

Synonymie[3]

Caractéristiques physico-chimiques

Cristallochimie

  • Elle fait partie du super-groupe de l'apatite et particulièrement du sous-groupe de la svabite.
Groupe de la svabite

Cristallographie

  • Paramètres de la maille conventionnelle : = 9,857 Å, = 7,13 Å ; Z = 2 ; V = 599,94 Å3
  • Densité calculée = 5,91 g cm−3

Gîtes et gisements

Gîtologie et minéraux associés

Gîtologie
dans les minéralisation secondaires des zones d’oxydation des gisements de Cu-Pb-Ag.
Minéraux associés
quartz, duftite, bayldonite, willémite

Gisements remarquables

  • Angleterre
Higher Roughton Gill, Caldbeck Fells, North and Western Region (Cumberland), Cumbria[6],
  • France
Mine de Saint-Salvy, Saint-Salvy-de-la-Balme, Tarn, Midi-Pyrénées, France
Mine Nuissière, Chenelette, Beaujeu, Rhône[7]

États-Unis

Silver Coin Mine, Valmy, Iron Point District, Comté de Humboldt, Nevada[8]

Notes et références

  1. La classification des minéraux choisie est celle de Strunz, à l'exception des polymorphes de la silice, qui sont classés parmi les silicates.
  2. Kampf, A.R., I.M. Steele, and R.A. Jenkins (2006): "Phosphohedyphane, the phosphate analog of hedyphane: Description and crystal structure": Am. Mineral. 91: 1909-1917.
  3. « Index alphabétique de nomenclature minéralogique » BRGM
  4. Annales des Mines troisième série Tome VIII, Paris 1835 P.243
  5. Manual of Mineralogy James Nicol, Edinburgh 1849 P.382
  6. Journal of The Russell Society, Volume11, 200
  7. Der Aufschluss 1974(3), 193-197
  8. Thomssen, D. and Wise, W. (2004). "Special list: Silver Coin Mine, Iron Point district, Edna Mountains, Humboldt Co., Nevada, États-Unis."

Voir aussi

Sur les autres projets Wikimedia :

Liens externes

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