Mckelveyite-(Y)

 IMA-A 1964-025
Uranium  
(Dana Classification Number)
(No Images) 5/D.04-20
(Strunz ID)

Property Data Remarks
Named for: Vincent E. McKelvey, (1916-1985), director of the U.S. Geological Survey
Alternate
    Name(s):
  		•  
    Mineral Class:
    Nitrates, Carbonates and Borates
      Water-bearing carbonates without unfamiliar anions
        Donnayite-(Y) - Weloganite series
    		 
    Chemical
        Formula:    		 Ba3Na(Ca,U)Y(CO3)6 · 3H2O  
    Chemical
        Composition:
    Barium: (Ba) 40.09%
    Carbon: (C) 7.01%
    Calcium: (Ca) 2.93%
    Hydrogen: (H) 0.59%
    Oxygen: (O) 32.70%
    Sodium: (Na) 2.24%
    Uranium: (U) 5.79%
    Yttrium: (Y) 8.65%
    		by weight
    Molecular
        Weight:    		 1,027.54 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.0366 × 1004 2.80 × 10-07 0.15 14.72

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Triclinic - Pinacoidal
    Axial Ratios: a: 1.0001
    b: 1
    c: 0.7657
    Cell Dimensions: a: 9.142 Å
    b: 9.141 Å
    c: 7 Å
    Z: 1
    a: 102.51°
    b: 115.67°
    g: 59.99°
    V: 445.71 Å3
    DenCalc: 3.83
    H-M Symbol: -1
    Space Group: P-1
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 2.915 Å
    (0.9): 4.46 Å
    (0.8): 2.638 Å
    		 
    Habit:
  		•  
    Cleavage:
    [???] Indistinct
    		 
    Fracture:    
    Moh's
        Hardness:    		 3.5 - 4  
    Density: 3.47 - 3.58 grams/cm3
    Color: Yellow, lemmon yellow, black, greenish gray, white, or gray  
    Streak: White  
    Luster: Vitreous  
    Diaphaneity: Translucent to Opaque  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Eocene-aged lacustrine deposits
    		•   
    Associated
        Minerals:

    Actinolite, Aegirine, Ancylite-(Ce), Ankerite, 'Apatite', Arfvedsonite, Barite, Bonshtedtite, Brookite, Burbankite, Calcite, Cancrinite, Carbocernaite, Catapleiite, 'Chabazite', Chalcopyrite, Diopside, Dolomite, Donnayite-(Y), Eudialyte, Ewaldite, Fluorapatite, Fluorite, Harmotome, Kukharenkoite-(Ce), Labuntsovite, Lamprophyllite, Lorenzenite, Magnesite, Magnetite, Microcline, Monazite-(Ce), Natrolite, Nepheline, Nordstrandite, Pectolite, Phlogopite, Pirssonite, Pyrite, Pyrochlore, Pyrrhotite, Quartz, Rasvumite, Rhodochrosite, Shortite, Siderite, Sidorenkite, Sodalite, Sphalerite, Strontianite, Thermonatrite, Titanite, Trona, Villiaumite, Vinogradovite, Zircon

    Mineral   -   > 75% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Mckelveyite-(Y)
    Locations:

    Rare

    Mckelveyite-(Y) Locations
    Notes:

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

    Crystals may be metamic.