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Wakefieldite ((La,Ce,Nd,Y)VO4) is an uncommon rare-earth element vanadate mineral. There are four main types described of wakefieldite- wakefieldite-(La), wakefieldite-(Ce), wakefieldite-(Nd), and wakefieldite-(Y), depending upon the dominant rare-earth metal ion present. Wakefieldite has a Mohs hardness ranging from 4 to 5. Wakefieldite forms crystals of tetragonal structure. In terms of crystal structure, it is the vanadate analog of the rare-earth phosphate mineral xenotime. Unlike xenotime, it is more favorable for wakefieldite to contain the lighter rare-earth elements over the heavier ones. Due to the lanthanide contraction, the heavier rare earths have smaller ionic radii than the lighter ones. When the phosphate anion is replaced by the larger vanadate anion, the tetragonal crystal

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rdf:type
rdfs:label
  • Wakefieldit (de)
  • Wakefieldite (en)
rdfs:comment
  • Wakefieldit ist die Sammelbezeichnung für ein nicht näher bestimmtes Mineral oder einen Mischkristall der Wakefieldit-Reihe aus der Mineralklasse der „Phosphate, Arsenate und Vanadate“ mit den Endgliedern * – CeVO4 * Wakefieldit-(La) – LaVO4 * – NdVO4 * – YVO4 Alle Mitglieder dieser Mischreihe kristallisieren im tetragonalen Kristallsystem und entwickeln meist mikroskopisch kleine Kristalle, die je nach Zusammensetzung und möglicher Fremdbeimengung farblos oder von gelblicher, hellrosa bis bräunlicher oder schwarzer Farbe sein können. (de)
  • Wakefieldite ((La,Ce,Nd,Y)VO4) is an uncommon rare-earth element vanadate mineral. There are four main types described of wakefieldite- wakefieldite-(La), wakefieldite-(Ce), wakefieldite-(Nd), and wakefieldite-(Y), depending upon the dominant rare-earth metal ion present. Wakefieldite has a Mohs hardness ranging from 4 to 5. Wakefieldite forms crystals of tetragonal structure. In terms of crystal structure, it is the vanadate analog of the rare-earth phosphate mineral xenotime. Unlike xenotime, it is more favorable for wakefieldite to contain the lighter rare-earth elements over the heavier ones. Due to the lanthanide contraction, the heavier rare earths have smaller ionic radii than the lighter ones. When the phosphate anion is replaced by the larger vanadate anion, the tetragonal crystal (en)
foaf:name
  • Wakefieldite (en)
name
  • Wakefieldite (en)
foaf:depiction
  • http://commons.wikimedia.org/wiki/Special:FilePath/Wakefieldite-(La)_,_Hausmannite_-_Grube_Glücksstern,_Gottlob,_Thüringen.jpg
dcterms:subject
Wikipage page ID
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sameAs
strunz
tenacity
  • Very brittle (en)
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thumbnail
caption
  • Wakefieldite- on hausmannite (en)
category
class
color
  • Canary-yellow, pale tan ; Dark red to coal-black, pale yellow to bluish gray ; Light pink, brown (en)
gravity
imagesize
symmetry
  • I41/amd (en)
system
has abstract
  • Wakefieldit ist die Sammelbezeichnung für ein nicht näher bestimmtes Mineral oder einen Mischkristall der Wakefieldit-Reihe aus der Mineralklasse der „Phosphate, Arsenate und Vanadate“ mit den Endgliedern * – CeVO4 * Wakefieldit-(La) – LaVO4 * – NdVO4 * – YVO4 Alle Mitglieder dieser Mischreihe kristallisieren im tetragonalen Kristallsystem und entwickeln meist mikroskopisch kleine Kristalle, die je nach Zusammensetzung und möglicher Fremdbeimengung farblos oder von gelblicher, hellrosa bis bräunlicher oder schwarzer Farbe sein können. (de)
  • Wakefieldite ((La,Ce,Nd,Y)VO4) is an uncommon rare-earth element vanadate mineral. There are four main types described of wakefieldite- wakefieldite-(La), wakefieldite-(Ce), wakefieldite-(Nd), and wakefieldite-(Y), depending upon the dominant rare-earth metal ion present. Wakefieldite has a Mohs hardness ranging from 4 to 5. Wakefieldite forms crystals of tetragonal structure. In terms of crystal structure, it is the vanadate analog of the rare-earth phosphate mineral xenotime. Unlike xenotime, it is more favorable for wakefieldite to contain the lighter rare-earth elements over the heavier ones. Due to the lanthanide contraction, the heavier rare earths have smaller ionic radii than the lighter ones. When the phosphate anion is replaced by the larger vanadate anion, the tetragonal crystal system preferentially accommodates the larger light rare-earth elements. Wakefieldite was first described for an occurrence in the Evans Lou mine, St. Pierre de Wakefield, Quebec, Canada and later designated Wakefieldite-(Y). (en)
cleavage
  • Good on {100} (en)
diaphaneity
  • Translucent to opaque (en)
formula
  • (en)
habit
  • Prismatic crystals, pulverulent masses (en)
IMAsymbol
  • Wf (en)
mohs
opticalprop
  • Uniaxial (en)
refractive
  • nω = 2.000, nε = 2.140 (en)
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