Brabantite

 IMA-A 1978-003
Thorium 38.4.3.4
(Dana Classification Number)
(No Images) 7/A.15-50
(Strunz ID)

Property Data Remarks
Named for: The Van der Made pegmatite, Brabant Farm, west of Itiro, Karibib district, Namibia, where it was first found
Alternate
    Name(s):
  • Lingaitukuang
    		•   
    Mineral Class:
    Phosphates, Arsenates and Vanadates
      Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and and REE's
        Monazite group
    		 
    Chemical
        Formula:    		 CaTh(PO4)2  
    Chemical
        Composition:
    Calcium: (Ca) 8.67%
    Oxygen: (O) 27.70%
    Phosphorus: (P) 13.41%
    Thorium: (Th) 50.22%
    		by weight
    Molecular
        Weight:    		 462.06 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRADs
    per hour    		 microSieverts
    2.2498 × 1004 6.08 × 10-07 0.31 3.11

    Estimated Average Annual Exposure: 3.6 RAD (3.6 centiSieverts)
    Crystalography:
    System: Monoclinic - Sphenoidal
    Axial Ratios: a: 0.9701
    b: 1
    c: 0.9299
    Cell Dimensions: a: 6.726 Å
    b: 6.933 Å
    c: 6.447 Å
    Z: 2
    b: 103.883°
    V: 291.85 Å3
    DenCalc: 5.26
    H-M Symbol: 2
    Space Group: P21
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.06 Å
    (0.75): 2.85 Å
    (0.7): 3.26 Å
    		 
    Habit:
  		•  
    Cleavage:
    [001] Good
    [010]  
    [100] Good
    		 
    Fracture:    
    Moh's
        Hardness:    		 5 - 5.5  
    Density: 4.72 grams/cm3
    Color: Grey-brown, Reddish brown  
    Streak:    
    Luster: Vitreous - Resinous  
    Diaphaneity: Transparent to Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • In a zoned granite pegmatite
    		•   
    Associated
        Minerals:

    Aegirine, Alunite, Analcime, Bavenite, Beryl, Beryl var: Bixbite, Beudantite, Bismuth, Bismuthinite, Bixbyite, Calcite, Cassiterite, Cerianite-(Ce), 'Chabazite', 'Chernovite-(Ce)', Chernovite-(Y), Chrysoberyl, 'Clinopyroxene', Cristobalite, Cryptomelane, Durangite, Epidote, Ferrocolumbite, Fluorapatite, Fluorite, Gahnite, 'Garnet Group', Gasparite-(Ce), Goethite, Gold, Halloysite, Hematite, 'Heulandite', Hidalgoite, Ilmenite, Jarosite, Kaolinite, Magnetite, 'Manganbixbyite', Maxwellite, Mesolite, 'Monazite', Montmorillonite, Mordenite, Muscovite, Nagyagite, Opal, Orthoclase, Pigeonite, Pseudobrookite, Quartz var: Amethyst, Quartz var: Chalcedony, Rutile, Sanidine, Sillimanite, 'Smectite Group', Spessartine, Stellerite, 'Stilbite', Stolzite, Todorokite, Topaz, Tridymite, Tripuhyite, Uraninite, Uranmicrolite, Vanadinite, Wakefieldite-(Y), Zircon

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Brabantite
    Localities:

    Extremely rare

    Brabantite Localities
    Notes:

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

    Crystals are probably metamic.