Orthojoaquinite-(Ce)

 IMA-1987
Thorium 60.1.1b.1
(Dana Classification Number)
(No Images) 8/E.08-90
(Strunz ID)

Property Data Remarks
Named for: its orthorhombic crystal structure, and the relationship to Joaquinite-Ce
Alternate
    Name(s):
  		•  
    Mineral Class:
    Silicates
      Cyclosilicates, quadruplet rings [Si4O11]-8]
        Joaquinite group,
    Baotite - Orthojoaquinite-(Ce) series
    		 
    Chemical
        Formula:    		 NaFe+2Ba2Ce2Ti2[Si4O12]2O2(OH) · H2O  
    Chemical
        Composition:
    Barium: (Ba) 19.79%
    Cerium: (Ce) 20.19%
    Hydrogen: (H) 0.15%
    Iron: (Fe) 4.02%
    Oxygen: (O) 31.12%
    Silicon: (Si) 16.19%
    Sodium: (Na) 1.66%
    Titanium: (Ti) 6.90%
    Thorium: (Th) (Trace)
    		by weight
    Molecular
        Weight:    		 1,388.16 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    452 1.22 × 10-08 0.01 0.65

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic
    Axial Ratios: a: 1.0848
    b: 1
    c: 2.3043
    Cell Dimensions: a: 10.48 Å
    b: 9.66 Å
    c: 22.26 Å
    Z: 4
    V: 2,253.53 Å3
    DenCalc: 4.09
    H-M Symbol:  
    Space Group: Ccmm or Ccm21
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 2.94 Å
    (0.9): 4.43 Å
    (0.8): 2.89 Å
    (0.6): 2.61 Å
    (0.6): 3.29 Å
    (0.5): 1.866 Å
    (0.4): 2.98 Å
    (0.4): 3.05 Å
    		 
    Habit:
  		•  
    Cleavage:
    [001] Good
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		 5.5  
    Density: 3.68 grams/cm3
    Color: Yellow, Light brown  
    Streak:    
    Luster: Vitreous - Glassy  
    Diaphaneity: Transparent  
    Pleochroism:
    (x): Light yellow
    (y:) Light yellow
    (z:) Colorless
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Actinolite, Aegirine, Albite, Andradite, Aragonite, Bario-Orthojoaquinite, Benitoite, Brochantite, Calcite, 'Chrysotile', Clinochlore, 'Crossite', Digenite, Diopside, Djurleite, Fluorapatite, Fresnoite, Joaquinite-(Ce), Magnetite, Natrolite, Neptunite, Pectolite, Sérandite, Titanite

    Mineral   -   All sites
    Mineral   -   67% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Orthojoaquinite-(Ce)
    Locations:

    Very rare

    Orthojoaquinite Locations
    Notes:

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

    Crystals are probably metamic.