Ekanite

 IMA-GP
Uranium (trace?)
Thorium		 72.1.1.1
(Dana Classification Number)
(No Images) 8/E.10-10
(Strunz ID)

Property Data Remarks
Named for: F.L.D. Ekanayake of Colombo, Sri Lanka, its discoverer
Alternate
    Name(s):
  		•  
    Mineral Class:
    Silicates
      Cyclosilicates, double quadruplet rings [Si8O20]8-
        Ekanite - Steacyite series
    		 
    Chemical
        Formula:    		 ThCa2Si8O20
    or:
    (Th,U)(Ca,Fe,Pb)2Si8O20    		 Chemically related to Iraqite-(La)
    Chemical
        Composition:
    Calcium: (Ca) 9.35%
    Oxygen: (O) 37.34%
    Silcon: (Si) 26.22%
    Thorium: (Th) 27.08%
    		by weight
    Molecular
        Weight:    		 856.87 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.2132 × 1004 3.28 × 10-07 0.18 17.82

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Tetragonal - Trapezohedral
    Axial Ratios: a: 1
    c: 1.99024
    Cell Dimensions: a: 7.483 Å
    c: 14.893 Å
    Z: 2
    V: 833.94 Å3
    DenCalc: 3.41
    H-M Symbol: 4/m 2/m 2/m
    Space Group: I422
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 4.14 Å
    (0.96): 3.34 Å
    (0.61): 6.69 Å
    		 
    Habit:
  		•  
    Cleavage:
    [101] Distinct
    [001] Indistinct
    		 
    Fracture: Brittle - Uneven  
    Moh's
        Hardness:    		 4.5 - 5 (some sources report as high as 6.5)
    Density: 2.95 - 3.28 grams/cm3
    Color: Light to dark Green, Yellowish-green, Straw Yellow, Yellowish-brown, Yellowish red  
    Streak: White  
    Luster: Vitreous  
    Diaphaneity: Transparent to Turbidly translucent  
    Dichroism:
    (e):  
    (w:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Aegirine, 'Aegirine-augite', Agrellite, Albite, Analcime, Anatase, Ancylite-(Ce), Anorthite, Arfvedsonite, Augite, Barite, Barytolamprophyllite, Biotite, Brookite, Calcite, Cancrinite, Chalcopyrite, Digenite, Diopside, Elpidite, Epididymite, Eudialyte, Fluorapatite, Fluorite, Galena, Grossular, Helvite, Hematite, Ilmenite, Labuntsovite, Lamprophyllite, Leucite, Leucosphenite, Lorenzenite, Magnetite, Microcline, Miserite, Molybdenite, 'Mosandrite', Narsarsukite, Nepheline, Pectolite, Pyrite, Quartz, Richterite, Rosenbuschite, Rutile, Scheelite, Sphalerite, Spinel, Stillwellite-(Ce), Strontianite, Taeniolite, Thalcusite, Titanite, Vesuvianite, Wadeite, Witherite, Wollastonite, Zircon

    Mineral   -   > 75% of sites
    Mineral   -   > 60% of sites
    Mineral   -   > 30% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Ekanite
    Localities:

    Rare

    Ekanite Localities
    Notes:

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

    Crystals are probably metamic.

    Sometimes used as a gemstone.