Ningyoite

 IMA-GP
Uranium 40.4.8.1
(Dana Classification Number)
(No Images) 7/C.29-70
(Strunz ID)

Property Data Remarks
Named for: Ningyo-toge Mine, Tottori Prefecture, Chugoku region, Honshu island, Japan, its type location
Alternate
    Name(s):
  		•  
    Mineral Class:
    Phosphates, Arsenates and Vanadates
      Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)+
        Rhabdophane group
    		 
    Chemical
        Formula:    		 (U,Ca,Ce)2(PO4)2 · 1-2H2O  
    Chemical
        Composition:
    Calcium: (Ca) 4.34%
    Cerium: (Ce) 5.05%
    Hydrogen: (H) 0.55%
    Oxygen: (O) 27.40%
    Phosphorus: (P) 11.17%
    Uranium: (U) 51.50%
    		by weight
    Molecular
        Weight:    		 554.67 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    9.2292 × 1004 2.49 × 10-06 1.27 126.60

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Disphenoidal
    Axial Ratios: a: 0.5603
    b: 1
    c: 0.5272
    Cell Dimensions: a: 6.78 Å
    b: 12.1 Å
    c: 6.38 Å
    Z: 3
    V: 523.40 Å3
    DenCalc: 5.28
    H-M Symbol: 2 2 2
    Space Group: P222
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.02 Å
    (0.8): 2.13 Å
    (0.8): 2.81 Å
    		 
    Habit:
  • Encrustations on pyrite
  • Microscopic crystals
  • Massive
    		•   
    Cleavage: None  
    Fracture:    
    Moh's
        Hardness:    		 3 - 4  
    Density: 4.75 grams/cm3
    Color: Brownish green, Brown  
    Streak:    
    Luster: Greasy  
    Diaphaneity: Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Main uranium ore in oxidation zone of a uranium deposit
  • Filling cracks in altered granite and conglomerate
  • Crusts on pyrites
  • Microscopically in pervious sedimentary deposits of uranium-zirconium ores
    		•   
    Associated
        Minerals:

    Carnotite, Chalcocite, Coffinite, Covellite, Dewindtite, Gypsum, Marcasite, Phosphuranylite, Pyrite, Quartz, Sabugalite, Sphalerite, Torbernite, Uraninite, Uranophane, Vyacheslavite

    Mineral   -   > 50% of sites
    Mineral   -   > 33% of sites
    Mineral   -   > 17% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Ningyoite
    Locations:

    Very rare

    Ningyoite Locations
    Notes:

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

    Crystals are probably metamic.