Seelite-1

 IMA-A 1992-005
Uranium 40.2a.12.1
(Dana Classification Number)
(No Images) 4/J.05-20
(Strunz ID)

Property Data Remarks
Named for: Paul and Hildegarde Seel, German collectors
Alternate
    Name(s):
  		•  
    Mineral Class:
    Phosphates, Arsenates and Vanadates
      Uranylphosphates and uranylvanadates with
    [UO2]2+ - [PO4 | AsO4]3- and
    [UO2]2+ - [V2O8]6-
        Autunite group
    		 
    Chemical
        Formula:    		 Mg[(UO2)(AsO3)x(AsO4)1-x]2 · 7H2O

    [x = ~0.7]    		 Hydrated Magnesium Uranyl Arsenate
    Chemical
        Composition:
    Arsenic: (As) 18.10%
    Hydrogen: (H) 2.27%
    Magnesium: (Mg) 3.91%
    Oxygen: (O) 37.37%
    Uranium: (U) 38.34%
    		by weight
    Molecular
        Weight:    		 620.82 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    7.7728 × 1004 2.10 × 10-06 0.98 98.13

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Prismatic
    Axial Ratios: a: 2.578
    b: 1
    c: 0.943
    Cell Dimensions: a: 18.2 Å
    b: 7.06 Å
    c: 6.66 Å
    Z: 3
    b: 99.65°
    V: 844.34 Å3
    DenCalc: 3.66
    H-M Symbol: 2/m
    Space Group: C2/m
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 9.05 Å
    (0.8): 1.92 Å
    (0.8): 4.44 Å
    		Seelite
    Crystal
    Habit:
  		•  
    Cleavage:
    [001]  
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		 3  
    Density: 3.7 grams/cm3
    Color: Canary yellow to Bright yellow, Honey-yellow  
    Streak: White  
    Luster: Vitreous  
    Diaphaneity: Transparent to Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Oxidation zone of a Uranium deposit
    		•   
    Associated
        Minerals:

    Annabergite, Aragonite, Arsenolite, Azurite, Barite, Becquerelite, Billietite, Bornite, Calcite, Chalcocite, Chalcopyrite, Chrysocolla, Clinoclase, Conichalcite, Copper, Cornwallite, Covellite, Digenite, Domeykite, Erythrite, Galena, Goethite, Graphite, Ianthinite, Idaite, Koutekite, Lavendulan, Löllingite, Malachite, Meta-Autunite, Metazeunerite, Mixite, Molybdenite, Nickel-Skutterudite, Novácekite, Pharmacosiderite, Pyrite, Pyrolusite, Safflorite, Scheelite, Schoepite, Silver, Sphalerite, Stromeyerite, Studtite, Torbernite, Tyrolite, Tyuyamunite, Uraninite, Uranophane, Wulfenite, Zeunerite, Zippeite

    Mineral   -   all sites
    Mineral   -   > 65% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Seelite-1
    Locations:

    Very rare

    No Seelite-1 Locations Listed
    See Seelite Locations
    Notes:

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

    Crystals are probably metamic.