Thorosteenstrupine

 IMA-GP
Thorium 61.4.2.2
(Dana Classification Number)
(No Images) 8/E.18-10
(Strunz ID)

Property Data Remarks
Named for: Knud Johannes Vogelius Steenstrup, Danish scientist, and being the Thorium-dominant analogue of Steenstrupine-(Ce).
Alternate
    Name(s):
  		•  
    Mineral Class:
    Silicates
      cyclosilicates, with
    rings of six tetrahedrons [Si6O18]-12
        Thorosteenstrupine series
    		 
    Chemical
        Formula:    		 (Ca,Th,Mn)3Si4O11F · 6H2O  
    Chemical
        Composition:
    Calcium: (Ca) 10.12%
    Fluorine: (F) 2.67%
    Hydrogen: (H) 1.70%
    Manganese: (Mn) 2.31%
    Oxygen: (O) 38.15%
    Silicon: (Si) 15.76%
    Thorium: (Th) 29.29%
    		by weight
    Molecular
        Weight:    		 712.88 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.3124 × 1004 3.55 × 10-07 0.19 19.45

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Amorphous
    X Ray Diffraction: By Intensity(I/Io): 2.61(1) 3.25(1) 4.08(1)
    		 
    Habit:
  		•  
    Cleavage: None  
    Fracture: Cochoidal  
    Moh's
        Hardness:    		 4  
    Density: 3.02 grams/cm3
    Color: Black-brown  
    Streak: Dark brown  
    Luster: Vitreous - Greasy  
    Diaphaneity: Translucent to Opaque  
    Pleochroism:
    (x):
    (y:)
    (z:)
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:
    Short Wave:
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Aegirine, Albite, 'Apatite', Augite, Barytolamprophyllite, Belovite, Chkalovite, Dorfmanite, Elpidite, Epididymite, Eudialyte, Fluorite, Galena, 'K Feldspar', Labuntsovite-Mn, Lamprophyllite, Lemmleinite, Leucosphenite, Lomonosovite, Lorenzenite, Microcline, Miserite, Narsarsukite, Natisite, Natrite, Natrolite, Natrophosphate, Nepheline, Pectolite, Phosinaite-(Ce), Quartz, Rasvumite, Shafranovskite, Shcherbakovite, Sodalite, Sphalerite, Steenstrupine-(Ce), Tisinalite, Villiaumite, Vitusite-(Ce), Vuonnemite, Zakharovite

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

    		These are minerals known to be found with Thorosteenstrupine
    Locations:

    Very rare

    Thorosteenstrupine Locations
    Notes:

    Radioactive a- and b-particles, g-rays.

    Crystals are probably metamic.