Perrierite-(Ce)

 IMA-GP
Thorium 56.2.8.3
(Dana Classification Number)
(Images) 8/C.17-10
(Strunz ID)

Property Data Remarks
Named for: Carlo Perrier (1886-1948), Italian mineralogist and chemist. Co-discoverer, with Emilio Segrè, of Technetium, which was originally proposed to be called 'masurium'.
Alternate
    Name(s):
  • Perrierite
    		•   
    Mineral Class:
    Silicates
      Unclassified Strunz Sorosilicates
        Fresnoite - Belkovite series
    		 
    Chemical
        Formula:    		 (Ce,La,Ca)4(Fe+2,Mg)2(Ti,Fe+3)3Si4O22  
    Chemical
        Composition:
    Aluminum: (Al) 0.22%
    Calcium: (Ca) 3.00%
    Cerium: (Ce) 15.16%
    Iron: (Fe) 6.04%
    Lanthanum: (La) 17.34%
    Magnesium: (Mg) 0.20%
    Manganese: (Mn) 1.37%
    Oxygen: (O) 29.29%
    Silicon: (Si) 9.35%
    Sodium: (Na) 0.38%
    Strontium: (St) 0.73%
    Thorium: (Th) 0.97%
    Titanium: (Ti) 11.16%
    REE2O3
        Lanthanum:
        Cerium:
        Praseodymium:
        Niodymium:
        Samarium:    		  
    (La)
    (Ce)
    (Pr)
    (Nd)
    (Sm)    		 |
    |
    |
    |
    |
    |    		 4.79%
    		by weight
    Molecular
        Weight:    		 1,201.74 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    433 1.17 × 10-08 0.01 0.62

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Prismatic
    Axial Ratios: a: 2.4217
    b: 1
    c: 2.0871
    Cell Dimensions: a: 13.61 Å
    b: 5.62 Å
    c: 11.73 Å
    Z: 2
    b: 113.5°
    V: 822.79 Å3
    DenCalc: 4.85
    H-M Symbol: 2/m
    Space Group: C21/a
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 2.96 Å
    (0.65): 2.82 Å
    (0.65): 5.34 Å
    		 
    Habit:
  • Prismatic
  • Massive
    		•   
    Cleavage:
    [001]  
    [010]  
    [100]  
    		 
    Fracture: Conchoidal - Uneven  
    Moh's
        Hardness:    		 5.5  
    Density: 4.29 - 4.45 grams/cm3
    Color: Brown-black  
    Streak: Brown  
    Luster: Resinous  
    Diaphaneity: Opaque to Translucent  
    Pleochroism:
    (x): Yellow
    (y:) Opaque or dark Red-violet
    (z:) Opaque or dark Brown
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • In sands derived from weathered tuffs
  • Syenite pegmatites
    		•   
    Associated
        Minerals:

    Aegirine, Aenigmatite, Albite, Arfvedsonite, Astrophyllite, Bertrandite, Calcite, Catapleiite, 'Chabazite', Elpidite, Epididymite, Eudialyte, Eudidymite, Fluorite, Goethite, Graphite, Gypsum, Hematite, Leucophanite, Lorenzenite, Låvenite, Magnetite, Microcline, Molybdenite, Monazite-(Ce), Nepheline, Polylithionite, Pyrite, Pyrochlore, Pyrophanite, Quartz, Sphalerite, Thorite, Titanite, Zircon

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

    		These are minerals known to be found with Perrierite-(Ce)
    Locations:

    Rare

    Perrierite Locations
    Notes:

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

    Perrierite Images

    Specimen #1
    (001a) (001b) (001c) (001d)

     
    (001e) (001f)
    Buer, Bjørkedalen, Porsgrunn, Telemark, Norway

    Specimen Notes

    Occurrence -  

     

    Crystals -  

     

    Appearence -  

    Diaphaniety -

    Luster -

     

      -  

     

    Specimen Physical Properties
    Size   cm   cm   cm
    Weight: x grams    
    g-Radiation Level:   cmp   msieverts background: 20 cpm