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Phosphates, Arsenates and Vanadates
This class is based on XO43- anionic complexes where X is P5+ (0.35Å), As5+ (0.46Å) and V5+ (0.59Å), larger than S6+ (0.30Å). The similarity in the size of the large X cation gives rise to several solid solution series within this class.
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Several groupings can be distinguished:
Anhydrous Monazite CePO4 (monazite can contain other majority rare earth or lanthanide elements, i.e. La, Nd, Th. In these cases, the new convention is for example to call the mineral monazite-La.)
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monazite
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Hydroxl or halogen Lazulite (Mg,Fe)Al2(PO4)2(OH)2 Triphyllite Li(Fe,Mn)PO4 Amblygonite series - amblygonite LiAlPO4F montebraesite LiAlPO4OH Apatite series – hydroxyapatiate Ca5(PO4)3OH chlorapatite Ca5(PO4)3Cl fluorapatite Ca5(PO4)3F Pyromorphite series – pyromorphite Pb5(PO4)3Cl mimetite Pb5(AsO4)3Cl vanadinite Pb5(VO4)3Cl
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apatite
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Apatite
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pyromorphite
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vanadinite
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Essential water Turquoise CuAl6(PO4)4(OH)8∙4H2O Wavellite Al3(PO4)2(OH)3∙5H2O Erythrite Co3(AsO4)2∙8H2O Autunite Ca(UO2)2(PO4)2∙10H2O Carnotite K2(UO2)2(VO4)2∙3H2O The last two minerals are two of many uranyl (UO22-) minerals, which are combined with various anionic complexes.
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turquiose
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wavellite
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autunite
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carnotite
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