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Orthowalpurgite

Formula:
(BiO)
 
4
(UO
 
2
)[AsO
 
4
]
 
2
 · 2H
 
2
O
System:OrthorhombicColour:Pale yellow
Lustre:AdamantineHardness:4½
This page provides mineralogical data about Orthowalpurgite.

Classification of Orthowalpurgite

IMA status:Approved 1994
Strunz 8th edition ID:7/E.10-15
Nickel-Strunz 10th (pending) edition ID:8.EA.05

8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
A : UO2:RO4 = 1:2
Dana 8th edition ID:40.5.9.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
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Type Occurrence of Orthowalpurgite

Type Locality:Schmiedestollen dump, Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany

Physical Properties of Orthowalpurgite

Lustre:Adamantine
Colour:Pale yellow
Hardness (Mohs):4½

Crystallography of Orthowalpurgite

Crystal System:Orthorhombic

Optical Data of Orthowalpurgite

Type:Biaxial (-)
RI values: nα = 1.910 nβ = 2.000 nγ = 2.050
2V:Measured: 70° , Calculated: 70°
Maximum Birefringence:δ = 0.140

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r < v

Chemical Properties of Orthowalpurgite

Formula:
(BiO)
 
4
(UO
 
2
)[AsO
 
4
]
 
2
 · 2H
 
2
O
Essential elements:As, B, H, I, O, U
All elements listed in formula:As, Bi, H, O, U

Relationship of Orthowalpurgite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.EA.05Walpurgite
(BiO)
 
4
(UO
 
2
)[AsO
 
4
]
 
2
 · 3H
 
2
O
8.EA.05Phosphowalpurgite
(BiO)
 
4
(UO
 
2
)[PO
 
4
]
 
2
 · 2H
 
2
O
8.EA.10Hallimondite
Pb
 
2
(UO
 
2
)[AsO
 
4
]
 
2
 · nH
 
2
O, 0 ≤ n ≤ 0.5
8.EA.10Parsonsite
Pb
 
2
(UO
 
2
)[PO
 
4
]
 
2
 · 2H
 
2
O
8.EA.15Ulrichite
CaCu(UO
 
2
)[PO
 
4
]
 
2
 · 4H
 
2
O
8.EA.20Lakebogaite
CaNaFe
3+
2
H(UO
 
2
)
 
2
(PO
 
4
)
 
4
(OH)
 
2
(H
 
2
O)
 
8

Other Names for Orthowalpurgite

Synonyms:
IMA1994-024
Other Languages:
German:Orthowalpurgin
Russian:Ортовальпургит
Spanish:Orthowalpurgita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Orthowalpurgite

Reference List:Mineralogical Record : 27: 465.

Krause, W., Effenberger, H., and Brandstätter, F. (1995) Orthowalpurgite, (UO2)Bi4O4(AsO4)2·2H2O, a new mineral from the Black Forest, Germany. European Journal of Mineralogy: 7: 1313-1324.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Articles/Blogs about Orthowalpurgite

Internet Links for Orthowalpurgite

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  • Raman and XRD data at RRUFF project
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  • Orthowalpurgite details from Handbook of Mineralogy (PDF)
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    Localities for Orthowalpurgite

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    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Schenkenzell
          • Wittichen
    		[Eur.J.Min.(1995) 7, 1313-1324; MinRec 27:465]
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