Ancylite-(Ce)

 IMA-1987
Uranium
(trace)		 16b.1.1.1
(Dana Classification Number)
(No Images) 5/E.08-30
(Strunz ID)

Property Data Remarks
Named for: its composition, and the Greek word for "curved," in allusion to the rounded and distorted character of the crystals.
Alternate
    Name(s):
 
Mineral Class:
Nitrates, Carbonates and Borates
  Water-bearing carbonates with unfamiliar anions
    Strontiodresserite - Dundasite series
 
Chemical
    Formula:		 SrCe(CO3)2(OH) · H2O  
Chemical
    Composition:
Carbon: (C) 6.28%
Cerium: (Ce) 36.60%
Hydrogen: (H) 0.79%
Oxygen: (O) 33.44%
Strontium: (Sr) 22.89%
Uranium: (U) (trace)
by weight
Molecular
    Weight:		 382.78 daltons (amu)
Specific
    Radioactivity:

(All radiation is for a 1 gram, fully aged specimen)

Specific Activity Dose Rate
Becquerels Curies  milliRems 
hour		  microSieverts 
hour
820 2.22 × 10-08 0.01 1.17

Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
Crystalography:
System: Orthorhombic - Dipyramidal
Axial Ratios: a: 0.5896
b: 1
c: 0.8546
Cell Dimensions: a: 5.03 Å
b: 8.53 Å
c: 7.29 Å
Z: 2
V: 312.78 Å3
DenCalc: 4.06
H-M Symbol: 2/m 2/m 2/m
Space Group: Pmcn
X-Ray Diffraction:
  By Intensity ( I/Io )		 (1): 2.96 Å
(1): 3.71 Å
(1): 4.34 Å
Ancylite-(Ce)
Crystal
Habit:
  • Crystalline
  • Pyramidal
    		•   
    Cleavage: None  
    Fracture: Brittle  
    Moh's
        Hardness:    		 4 - 4.5  
    Density: 3.9 grams/cm3
    Color: Brown, Brown red, Colorless, Gray, Gray pink  
    Streak: White  
    Luster: Vitreous - Greasy  
    Diaphaniety: Transparent to Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Aegirine, Albite, Analcime, Anatase, Barite, Bastnäsite-(Ce), Biotite, Calcite, Catapleiite, Chalcopyrite, Eudialyte, Fluorapatite, Fluorite, Galena, Hematite, Ilmenite, Lorenzenite, Magnetite, Monazite-(Ce), Muscovite, Natrolite, Nepheline, Orthoclase, Pyrite, Pyrochlore, Pyrrhotite, Quartz, Sodalite, Sphalerite, Strontianite, Titanite, Zircon

    Mineral   -   > 67% of sites
    Mineral   -   > 50% of sites
    Mineral   -   > 33% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Ancylite-(Ce)
    Localities:

    Rare

    Ancylite-(Ce) Localities
    Notes:

    Strongly radioactive a- and b-particles, g-rays.

    Crystals are probably metamic.