Rameauite

 IMA-A 1971-045
Uranium 5.5.2.1
(Dana Classification Number)
(No Images) 4/H.02-20
(Strunz ID)

Property Data Remarks
Named for: Jacques Rameau (1926-1960), French prospector who discovered the deposit where the mineral occurs
Alternate
    Name(s):
  • (also see Compreignacite for comparison)
    		•   
    Mineral Class:
    Oxides
      Uranyl ([UO2]2+) hydroxides and hydrates
        Agrinierite - Rameauite series
    		 
    Chemical
        Formula:    		 K2CaU6O20 . 9H2O  
    Chemical
        Composition:
    Calcium) (Ca) 1.98%
    Hydrogen: (H) 0.89%
    Oxygen: (O) 22.87%
    Potassium: (K) 3.85%
    Uranium: (U) 70.40%
    		by weight
    Molecular
        Weight:    		 2,028.57 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.26022 × 1005 3.41 × 10-06 1.67 167.28

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic
    Axial Ratios: a: 0.9796
    b: 1
    c: 0.9971
    Cell Dimensions: a: 13.97 Å
    b: 14.26 Å
    c: 14.22 Å
    Z: 4
    b: 121.02°
    V: 2,427.67 Å3
    DenCalc: 5.55
    H-M Symbol:  
    Space Group: C2/c, Cc
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.319 Å
    (1): 3.495 Å
    (1): 7.12 Å
    		 
    Habit:
  • Prismatic
  • Pseudo Hexagonal
    		•   
    Cleavage:
    [001]  
    [010] Good
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		    
    Density: 5.6 grams/cm3
    Color: Orange  
    Streak:    
    Luster:    
    Diaphaneity:    
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • On pitchblende
    		•   
    Associated
        Minerals:

    Agrinierite, Autunite, Barite, Becquerelite, Billietite, Coffinite, Compreignacite, Curite, Fluorite, 'Gummite', Hematite, Ianthinite, Meta-Autunite, Parsonsite, Phosphuranylite, 'Pitchblende', Quartz, Sabugalite, Schoepite, Uraninite, Uranophane, Uranophane-beta, Wolsendorfite,

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Rameauite
    Locations:

    Extremely rare

    Rameauite Locations
    Notes:

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