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Subclass: Vanadates

Group of minerals that are compounds of one or more metallic element associated with the vanadate radical (VO4). The vanadates, together with the related arsenates, are classified in the phosphates group. Most vanadates are heavy, and none are hard. They are usually brittle and occur in small crystals or compact aggregates.

Name Namibite Cu(BiO)2(VO4)(OH)
Colour Dark green
Lustre  
Crystal system Triclinic
Hardness 4½ - 5  

 

Name Turanite Cu5(VO4)2(OH)4
Colour Green, olive-green
Lustre  
Crystal system Triclinic
Hardness  

 

Name Stoiberite Cu5(VO4)2O2
Colour Black
Lustre Metallic
Crystal system Monoclinic
Hardness    

 

Name Fingerite Cu11(VO4)6O2
Colour black
Lustre Metallic
Crystal system Triclinic
Hardness    

 

Name Averievite Cu6(VO4)2O2Cl2
Colour Black  
Lustre Resinous
Crystal system Trigonal
Hardness  

 

 

Subclass: The Uranyl Phosphates and Arsenates

Name Torbernite Cu(UO2)2(PO4)2 12H2O
Colour Emerald-green
Lustre Sub-Adamantine, Vitreous, Waxy, Pearly
Crystal system Tetragonal
Hardness 2 - 2½  

 

Name Zeunerite Cu(UO2)2(AsO4)2 12H2O Water content was previously thought to range between 10 and 16 H2O.
Colour Yellow-green
Lustre Vitreous
Crystal system Tetragonal
Hardness

 

Name Uranospinite Ca(UO2)(AsO4)2 10H2O
Colour Yellow, lemon-yellow
Lustre Waxy, Pearly, Earthy
Crystal system Tetragonal
Hardness 2 - 3

 

 

Name Bassetite Fe2+(UO2)2(PO4)2 8H2O
Colour brownish yellow
Lustre Sub-Vitreous, Waxy
Crystal system Monoclinic
Hardness

 

Name Autunite Ca(UO2)2(PO4)2 11H2O
Colour Yellow, greenish-yellow
Lustre Sub-Vitreous, Resinous, Waxy, Pearly
Crystal system Orthorhombic
Hardness 2 - 2½

 

 


Date: 2015-12-24; view: 273


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Subclass: Arsenates | Subclass: Tungstate
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