Umbozerite

 IMA-A 1973-039
Thorium 78.7.17.1
(Dana Classification Number)
(No Images) 8/A.10-10
(Strunz ID)

Property Data Remarks
Named for: Umbozero Lake (Lake Umba), Karnasurt Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia; its type location
Alternate
    Name(s):
  		•  
    Mineral Class: Nesosilicates -
    - Umbozerite series    		  
    Chemical
        Formula:    		 Na3Sr4ThSi8(O,OH)24  
    Chemical
        Composition:
    Hydrogen: (H) 0.48%
    Oxygen: (O) 30.33%
    Silicon: (Si) 17.74%
    Sodium: (Na) 5.45%
    Strontium: (Sr) 27.68%
    Thorium: (Th) 18.33%
    		by weight
    Molecular
        Weight:    		 1,266.20 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    8.210 × 1003 2.22 × 10-07 0.12 11.88

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Amorphous
    X Ray Diffraction: By Intensity(I/Io): 3.29(1) 1.701(0.8) 3.38(0.6)
    		 
    Habit:
  • Amorphous
  • Pseudo Tetragonal
  • Acicular prismatic (to 1.6 cm long, sometimes curved)
  		•   
    Cleavage: None  
    Fracture: Conchoidal - Brittle  
    Moh's
        Hardness:    		 5  
    Density: 3.6 grams/cm3
    Color: Bottle-green to mottled Greenish brown  
    Streak:    
    Luster: Vitreous  
    Diaphaneity:    
    Pleochroism:
    (x):
    (y:)
    (z:)
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:
    Short Wave:
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • In ussingite pneumatolytic-hydrothermal veinlets cutting alkalic rocks in the upper part of a differentiated alkalic massif
  		•   
    Associated
        Minerals:

    Aegirine, Albite, Arfvedsonite, Belovite, Cancrisilite, Chkalovite, Dorfmanite, Elpidite, Epididymite, Epistolite, Eudialyte, Gerasimovskite, Korobitsynite, Lamprophyllite, Leifite, Lorenzenite, Löllingite, Malinkoite, 'Mangan-neptunite', Manganonordite-(Ce), Murmanite, Nastrophite, Natrite, Nenadkevichite, Quartz, Sphalerite, Steenstrupine-(Ce), Sérandite, Terskite, Tisinalite, Tugtupite, Ussingite, Villiaumite, Vuonnemite, Zakharovite

    Mineral   -   All of the sites
    Mineral   -   > 80% of sites
    Mineral   -   > 60% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Umbozerite
    Locations:

    Rare

    Umbozerite Locations
    Notes:

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

    Crystals are probably metamic.