Threadgoldite

 IMA-A 1978-066
Uranium 42.11.13.3
(Dana Classification Number)
(Images) 7/E.05-40
(Strunz ID)

Property Data Remarks
Named for: Ian M. Threadgold (1929- ), University of Sydney, NSW, Australia
Alternate
    Name(s):
  		•  
    Mineral Class: Phosphates, Arsenates and Vanadates -
    - Ranunculite - Moreauite series    		  
    Chemical
        Formula:    		 Al(UO2)2(PO4)2(OH) · 8H2O  
    Chemical
        Composition:
    Aluminum: (Al) 2.94%
    Hydrogen: (H) 1.87%
    Oxygen: (O) 36.60%
    Phosphorus: (P) 6.75%
    Uranium: (U) 51.85%
    		by weight
    Molecular
        Weight:    		 918.11 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    9.2815 × 1004 2.51 × 10-06 1.30 130.41

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Prismatic
    Axial Ratios: a:b:c = 2.0558:1:2.005
    Cell Dimensions: a = 20.25, b = 9.85, c = 19.75, Z = 8; beta = 111.4° V = 3,667.79 Den(Calc)= 3.33
    H-M Symbol: 2/m
    Space Group: C2/c
    X Ray Diffraction: By Intensity(I/Io): 9.43(1) 3.474(0.8) 3.366(0.6)
    		 
    Habit:
  • Micaceous
  • Tabular
    		•   
    Cleavage:
    [???] Perfect
    		 
    Fracture:    
    Moh's
        Hardness:    		 2 - 3  
    Density: 3.4 grams/cm3
    Color: Greenish yellow  
    Streak: Yellow white  
    Luster:    
    Diaphaneity: Translucent  
    Pleochroism:
    (x): Colorless
    (y:)
    (z:) Pale yellow
    		 
    Ultra Violet
        Fluorescence:
    Long Wave: Green
    Short Wave: Pale green
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • The Phosphorus analog of metavanuralite
  		•   
    Associated
        Minerals:

    Althupite, Amblygonite, Beryl, 'Columbite', Dumontite, Eylettersite, Furongite, Kamitugaite, Lusungite, Meta-Autunite, Metavanmeersscheite, Montebrasite, 'Moreauite', Mundite, Phosphuranylite, Phuralumite, Plumbomicrolite, Quartz, Ranunculite, Rutherfordine, Saléeite, Studtite, Triangulite, Upalite, Uraninite, Vanmeersscheite

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Threadgoldite
    Locations:

    Extremely rare

    Threadgoldite Locations
    Notes:

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

    Crystals are probably metamic.

    Threadgoldite Images

    Kobokobo Pegmatite, Lusungu River District, Kivu, Congo (Zaïre)
    Threadgoldite filling fissures and cracks in micaceous gneiss