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Astrocyanite-(Ce)

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Formula:
Cu2Ce2(UO2)(CO3)5(OH)2 · 1.5H2O
System:
Hexagonal
Colour:
Bright blue
Lustre:
Vitreous, Earthy
Hardness:
2 - 3
Name:
From the Greek άστρον ("astron") for "star", κυανός ("kyanos") for "blue", in allusion to its colour and habit of the aggregates, and the dominant lanthanide element in its composition.
Unique combination of elements.


Classification of Astrocyanite-(Ce)

Approved
Approval Year:
1989
First Published:
1990
5.EF.05

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
F : UO2:CO3 = 1:5
16b.1.6.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
1 : AmBn(XO3)pZqxH2O & with (m+n):p = 1:1
11.11.17

11 : Carbonates
11 : Carbonates of Cr and U

Physical Properties of Astrocyanite-(Ce)

Vitreous, Earthy
Diaphaneity (Transparency):
Translucent, Opaque
Colour:
Bright blue
Streak:
White, blue (bluish)
Hardness (Mohs):
2 - 3
Density:
3.80 g/cm3 (Measured)    3.95 g/cm3 (Calculated)

Optical Data of Astrocyanite-(Ce)

Type:
Uniaxial (-)
RI values:
nω = 1.688 nε = 1.638
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Strong
Comments:
Strongly pleochroic from bright blue to pale blue, almost colorless.

Chemical Properties of Astrocyanite-(Ce)

IMA Formula:
Cu2Ce2(UO2)(CO3)5(OH)2 · 1.5H2O
Elements listed in formula:

Crystallography of Astrocyanite-(Ce)

Crystal System:
Hexagonal
Morphology:
Platy {001}
X-Ray Powder Diffraction Data:
d-spacingIntensity
13.3 (40)
6.73 (100)
4.30 (50)
4.16 (60)
3.72 (90)
2.488 (40)
2.154 (40)
2.071 (40)
Comments:
114.6-mm Debye-Scherrer camera, copper Ka radiation

Type Occurrence of Astrocyanite-(Ce)

General Appearance of Type Material:
Delicate rostettes of tablets.
Place of Conservation of Type Material:
Institut royal des Sciences naturalles de Belgique, Brussels, Belgium.
Geological Setting of Type Material:
Oxidation product of uraninite.

Relationship of Astrocyanite-(Ce) to other Species

11.11.1StichtiteMg6Cr2CO3(OH)16 · 4H2O
11.11.2Rutherfordine(UO2)CO3
11.11.3Joliotite(UO2)(CO3) · 2H2O
11.11.4GrimseliteK3Na(UO2)(CO3)3 · H2O
11.11.5BayleyiteMg2(UO2)(CO3)3 · 18H2O
11.11.6MetazelleriteCa(UO2)(CO3)2 · 3H2O
11.11.7ZelleriteCa(UO2)(CO3)2 · 5H2O
11.11.8WyartiteCaU5+(UO2)2(CO3)O4(OH) · 7H2O
11.11.9UrancalcariteCa(UO2)3CO3(OH)6 · 3H2O
11.11.10SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2O
11.11.11VogliteCa2Cu(UO2)(CO3)4 · 6H2O
11.11.12AndersoniteNa2Ca(UO2)(CO3)3 · 6H2O
11.11.13SwartziteCaMg(UO2)(CO3)3 · 12H2O
11.11.14RabbittiteCa3Mg3(UO2)2(CO3)6(OH)4 · 18H2O
11.11.15Kamotoite-(Y)Y2O4(UO2)4(CO3)3 · 14H2O
11.11.16Shabaite-(Nd)CaNd2(UO2)(CO3)4(OH)2 · 6H2O
11.11.18Bijvoetite-(Y)Y8(UO2)16O8(CO3)16(OH)8 · 39H2O
11.11.19WidenmannitePb2UO2(CO3)2(OH)2
11.11.20ZnucaliteCaZn11(UO2)(CO3)3(OH)20 · 4H2O

Other Names for Astrocyanite-(Ce)

Name in Other Languages:

Other Information

Other Information:
Soluble with effervescence in dilute HCl.
Special Storage/
Display Requirements:
Radioactive
Health Risks:
This radioactive species sit always on massive uraninite and should be manipulated and stored with precautions.

References for Astrocyanite-(Ce)

Reference List:
Deliens, M., Piret, P. (1990) L'astrocyanite-(Ce), Cu2(TR)2(UO2)(CO3)5(OH)2·1,5 H2O, nouvelle espèce minérale de Kamoto, Shaba, Zaïre. European Journal of Mineralogy: 2: 407-411.

Deliens, M., Piret, P., Van Der Meersche, E. (1990) Les minéraux secondaires d'uranium du Zaïre, deuxieme complement. Royal Museum for Central Africa / Musée Royal de l'Afrique Centrale.

Jambor, J.L., Puziewicz, J. (1991) New mineral names. American Mineralogist: 76: 665-671.

Mandarino, J.A. (1997) New Minerals 1990-1994. Mineralogical Record, Inc., Tucson, AZ.

http://virtualcollections.naturalsciences.be/virtual-collections/geology/mineralogy/mineralogy-types/astrocyanite-ce-rc3513

Internet Links for Astrocyanite-(Ce)

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https://www.mindat.org/min-404.html
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Localities for Astrocyanite-(Ce)

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Democratic Republic of Congo (Zaïre) (TL)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Kolwezi District
        • Kamoto
[Mandarino, 1997]; Eur. J. Mineral., 1990, 2
Mineral and/or Locality  
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