Management of Commercially Generated Radioactive Waste - U.S. ...

U0 2 :X0 4
P.32
TABLE P.2.4. Uranyl Phosphates, Arsenates, Vanadates
4:2 Arsenuranylite Ca(U0 2 ) 4 (AsO 4 ) 2 (OH) 4-6H 2 0
Bergenite Ba(U0 2 ) 4 (PO4) 2 (OH) 4.8H 20
Renardite Pb(U0 2) 4(PO4) 2 (OH) 4 "7H 20
3:2 Troegerite (U0 2) 3(AsO 4) 2 * 2H 20 (see 2:2)
Huegelite Pb 2 (UO 2 ) 3(AsO 4 )2(OH)4-3H 20
Dumontite Pb 2 (UO 2) 3(PO 4 ) 2(OH) 4 "3H 20
Phosphuranylite Ca(U0 2) 3 (PO 4 ) 2(OH) 4 .7H 20
2:2 Carnotite K 2 (U0 2) 2 (V 20 8 ) 3-5H 20
Tyuyamunite Ca(U0 2) 2 (V 20 8 ).5-8H 20
Metatyuyamunite Ca(U0 2) 2 (V 20 8 )-3H 20
Curienite Pb(U0 2) 2 (V 20 8).5H
20
Francevillite Ba(U0 2 ) 2 (V 20 8)'5H 20
Strelkinite Na 2(UO 2 ) 2 (V 20 8 )-6H 20
Autunite Cal-2(UO 2) 2 (PO4) 2.8-12H 20
Meta-autunite I Ca 1_2 (U0 2 ) 2 (PO 4 ) 2.6-8H 20
Meta-autunite II Ca 1_2(U0 2 ) 2(P0 4) 2.4-6H 20
Meta-vanuralite Al(U0 2) 2 (V0 4 ) 2 (OH).8H 20
Vanuralite Al(UO 2) 2(VO 4) 2 (OH)'11H 20
Vanuranylite (H 30,Ba,Ca,K) 1.6(U0 2 ) 2 (VO 4)2.4H 20
Dewindtite Pb(U0 2 ) 2(P0 4 ) 2'3H 20
Sengierite Cu(U0 2) 2(V 20 8 )-8-10H 20
2:3 Coconinoite Fe2 2 (UO 2 ) 2(PO 4 ) 2(SO4)(OH) 2*20H 20
2:4 Parsonsite Pb 4 (U0 2 ) 2 (PO 4 ) 2"2H 20
Przhevalskite Pb(U0 2) 2 (PO 4) 4*4H 20
Pseudoautunite (H 30) 4Ca 2 (UO 2 ) 2 (PO 4 ) 4*5H 20
Walpurgite (BiO) 4 (UO 2) 2 (AsO 4) 4-6H 20
Hallimondite Pb 2 (U0 2) 2 (As04) 2
The abundance of uranyl phosphates and arsenates results more from the stability of
uranyl phosphate and uranyl arsenate complexes in ground water (Langmuir 1978) than from any
abundance of P or As. The complex polymerizes readily into sheet-like crystal structures,
which incorporate a variety of low-charge cations and water molecules between the sheets.
Thus, they form a large number of mineral species depending on the available cation. The
toxicity of As, however makes it less.desirable additive.
The most important mineral family in the phosphates is the autunite minerals. The
family is usually broken into three groups--autunite, meta-autunite I, and meta-autunite II,