Bergenite

 IMA-GP
Uranium 42.4.5.3
(Dana Classification Number)
(Images) 7/E.07-60
(Strunz ID)

Property Data Remarks
Named for: Bergen, Saxony, Germany, its type locality
Alternate
    Name(s):
  • Barium-Phosphuranylite
  
Mineral Class:
Phosphates, Arsenates and Vanadates
  Uranylphosphates and uranylvanadates with
[UO2]+2 - [PO4 | AsO4]-3 and
[UO2]+2 - [V2O8]-6
    Phosphuranylite series
 
Chemical
    Formula:		 (Ba,Ca)2(UO2)3(PO4)2(OH)4 · 5.5H2O  
Chemical
    Composition:
Barium: (Ba) 12.31%
Calcium: (Ca) 1.80%
Hydrogen: (H) 1.13%
Oxygen: (O) 28.33%
Phosphorus: (P) 4.86%
Uranium: (U) 51.57%
by weight
Molecular
    Weight:		 1,338.47 daltons (amu)
Specific
    Radioactivity:

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

Specific Activity Dose Rate
Becquerels Curies  milliRems 
hour		  microSieverts 
hour
9.2315 × 1004 2.49 × 10-06 1.26 125.71

Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
Crystalography:
System: Monoclinic - Prismatic
Axial Ratios: a: 1.3566
b: 1
c: 1.2001
Cell Dimensions: a: 23.32 Å
b: 17.19 Å
c: 20.63 Å
Z: 18
b: 93°
V: 8,258.63 Å3
DenCalc: 4.84
H-M Symbol: 2/m
Space Group: P21/c
X-Ray Diffraction:
  By Intensity ( I/Io )		 (1): 7.73 Å
(0.8): 3.837 Å
(0.6): 3.054 Å
Bergenite
Crystals
Habit:
  • Tabular
  • Acicular
    		•   
    Cleavage:
    [???] Perfect
    		 
    Fracture:    
    Moh's
        Hardness:    		 2 - 3  
    Density: 4.1 grams/cm3
    Color: Yellow  
    Streak: Yellow white  
    Luster:    
    Diaphaneity: Semitransparent  
    Pleochroism:
    (x): Colorless
    (y:) Colorless
    (z:) Colorless
    		 
    Ultra Violet
        Fluorescence:
    Long Wave: Fluorescent
    Pale Green - weak
    Short Wave: Pale slightly Yellowish-green - weak
    		(One Specimen Examined for Color and Strength Data)
    Magnetism: Non-magnetic  
    Occurance:
  • Secondary uranium phosphate mineral
    		•   
    Associated
        Minerals:

    Arsenopyrite, Arsenuranylite, Autunite, Barite, Becquerelite, Billietite, Bismuth, Bismuthinite, Bornite, Brochantite, Calcite, Chalcocite, Chalcopyrite, Chrysocolla, Clausthalite, Curite, Dewindtite, Dolomite, Fluorite, Galena, Goethite, Gypsum, Hematite, Johannite, Kasolite, Lepidocrocite, 'Limonite', Löllingite, Malachite, Marcasite, Meta-Autunite, 'Meta-Uranocircite', Metatorbernite, Molybdenite, Muscovite, Nickeline, Nontronite, Phosphuranylite, Proustite, 'Psilomelane', Pyrite, Pyrolusite, Pyrrhotite, Quartz, Quartz var: Chalcedony, Quartz var: Smoky Quartz, Russellite, Safflorite, Schorl, Siderite, Silver, Soddyite, Sphalerite, Tennantite, Torbernite, Uraninite, Uranocircite, Uranophane, Uranopilite, 'Wolframite', Zeunerite, Zippeite

    Mineral   -   100% of sites
    Mineral   -   > 75% of sites
    Mineral   -   > 50% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Bergenite
    Localities:

    Very rare

    Bergenite Localities
    Notes:

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

    Crystals are probably metamic.

    Bergenite Images

    Bergenite Specimen #1
    (001)

     
    (001a) (001b) (001c) (001d)
    Bergen, Falkenstein, Vogtland, Saxony, Germany
    Bergenite Specimen #2
    (002a) (002b) (002c) (002d)
    Bergen, Falkenstein, Vogtland, Saxony, Germany