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Sengierite

A valid IMA mineral species - grandfathered
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Cu2(UO2)2(VO4)2 · 6H2O
Colour:
Olive-green, yellowish green
Lustre:
Adamantine, Vitreous
Hardness:
2½
Specific Gravity:
4.05
Crystal System:
Monoclinic
Member of:
Carnotite Group
Name:
Named in honor of Edgard Sengier (9 October 1879, Kortrijk, Belgium - 26 July 1963, Cannes, France), Director, Union Miniere du Haut-Katanga, Zaire. He provided uranium ores from Katanga for the Manhattan project.
Type Locality:
ⓘLuiswishi Mine, Kawama, Kipushi Territory, Haut-Katanga, DR Congo
Carnotite Group.

An uncommon secondary mineral deposited from solutions derived from altering uraninite.

Visually very similar tovolborthite.


Unique Identifiers
IMA Formula:
Cu2(UO2)2(VO4)2(OH)2 · 6H2O
First published:
1949
Type description reference:
Vaes, J. F., Kerr, Paul F. (1949) Sengierite, a preliminary description.American Mineralogist, 34 (1-2) 109-120

Classification of Sengierite

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
B : Uranyl Sorovanodates
Dana 8th ed.:
42.6.10.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq·xH2O
Hey's CIM Ref.:
21.4.6

21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni

Mineral Symbols
Transparency:
Transparent
Colour:
Olive-green, yellowish green
Streak:
Light green
Hardness:
2½ onMohs scale
Tenacity:
Brittle
Cleavage:
Perfect
On {001}, perfect
Density:
4.05 g/cm3 (Measured)    4.1 g/cm3 (Calculated)

Optical Data of Sengierite
Surface Relief:
Moderate
Dispersion:
r > v
Pleochroism:
Visible
Comments:
X = Bluish green to colourless
Y = Olive-green to greenish yellow
Z = Yellowish green to colourless

Chemistry of Sengierite

Crystallography of Sengierite
General Appearance of Type Material:
Small, green, platy crystals
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA: #103963.
Associated Minerals at Type Locality:
ChrysocollaMalachiteVandenbrandeiteVolborthite
Reference:
Vaes, J. F., Kerr, Paul F. (1949) Sengierite, a preliminary description.American Mineralogist, 34 (1-2) 109-120

Other Language Names for Sengierite

Relationship of Sengierite to other Species
Other Members of Carnotite Group:
CarnotiteK2(UO2)2(VO4)2 · 3H2OMon. 2/m :P21/b
Margaritasite(Cs,K,H3O)2(UO2)2(VO4)2 · H2OMon. 2/m :P21/b
MetatyuyamuniteCa(UO2)2(VO4)2 · 3H2OOrth.mmm(2/m2/m2/m)
MetavanuraliteAl(UO2)2(VO4)2(OH) · 8H2OTric.
StrelkiniteNa2(UO2)2(VO4)2 · 6H2OOrth.
TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2OOrth.mmm(2/m2/m2/m) :Pnna
VanuraliteAl(UO2)2(V2O8)(OH) · 11H2OMon. 2/m

Common AssociatesMon. 2/m :P21/b4.HB.05CarnotiteK2(UO2)2(VO4)2 · 3H2OMon. 2/m :P21/b4.HB.15FrancevilliteBa(UO2)2(VO4)2 · 5H2OOrth.mmm(2/m2/m2/m)4.HB.15FritzscheiteMn(UO2)2(PO4,VO4)2 · 10H2O (?)Tet.4.HB.15CurienitePb(UO2)2(VO4)2 · 5H2OOrth.mmm(2/m2/m2/m)4.HB.15FinchiteSr(UO2)2(V2O8) · 5H2OOrth.mmm(2/m2/m2/m)4.HB.20VanuraliteAl(UO2)2(V2O8)(OH) · 11H2OMon. 2/m4.HB.20MetavanuraliteAl(UO2)2(VO4)2(OH) · 8H2OTric.4.HB.25MetatyuyamuniteCa(UO2)2(VO4)2 · 3H2OOrth.mmm(2/m2/m2/m)4.HB.25TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2OOrth.mmm(2/m2/m2/m) :Pnna4.HB.30StrelkiniteNa2(UO2)2(VO4)2 · 6H2OOrth.4.HB.35UvaniteU6+2V5+6O21 · 15H2O (?)Orth.4.HB.40RauviteCa(UO2)2(V10O28) · 16H2O4.HB.45VandermeerscheiteK2[(UO2)2V2O8] · 2H2OMon. 2/m

Radioactivityshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).

D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield

Other Information
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  • Raman and XRD data at RRUFF project
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    • References for SengieriteⓘHuemul MineBrodtkorb+1 other reference
    Czech Republic
     
    Pauliš P. et al. (Kutna Hora, issue 1)Desor (05/2022)+1 other reference
    DR Congo
     
    Deliens (1996)KMMA+3 other referencesWilson (2018)KMMA+1 other reference
    France
     
    Germany
     
    Kolitsch et al. (2005)
    Italy
     
    Balestra C. (2014)Bonifazi (2021)
    Morocco
     
    Hutton (1957)
    Russia
     
    Pavel M. Kartashov analytical data 2012
    Spain
     
    mineralsabella.blogspot.com (2009)+1 other referencewww.foro-minerales.com (n.d.)www.foro-minerales.com (n.d.)www.foro-minerales.com (n.d.)
    USA
     
    Hutton (1957)+2 other referencesDesor (10/2024)
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