• Johnsenite-(Ce) - Wikipedia

    en.wikipedia.org/wiki/Johnsenite-(Ce) Johnsenite- (Ce) It is the third eudialyte-group mineral with essential tungsten (after khomyakovite and manganokhomyakovite ), and second with essential rare earth elements (after zirsilite- (Ce), which is the niobium-analogue of johnsenite- (Ce)). In fact, some niobium substitutes for tungsten in johnsenite- (Ce).
  • Johnsenite-(Ce): Mineral information, data and localities.

    www.mindat.org/min-27479.html About Johnsenite- (Ce) Hide. The W analogue of Zirsilite- (Ce). The only silicate containing dominant (essential) Ce and W. Second Ce-W mineral after yttrotungstite- (Ce). One of four W-bearing silicates, the other ones being khomyakovite, manganokhomyakovite, and welinite.
  • Johnsenite-(Ce):Properties and Occurrences - Assignment Point

    www.assignmentpoint.com/science/.../johnsenite-ceproperties-and-occurrences.html Johnsenite-(Ce) is a very rare mineral of the eudialyte group, with formula Na 12 (Ce,La,Sr,Ca,[]) 3 Ca 6 Mn 3 Zr 3 WSi(Si 9 O 27) 2 (Si 3 O 9) 2 (CO 3)O(OH,Cl) 2. It is a mineral containing calcium, chlorine, hydrogen, iron, oxygen, silicon, sodium, strontium, tungsten, and zirconium.
  • Johnsenite-(Ce) Mineral Data

    webmineral.com/data/Johnsenite-(Ce).shtml PE Johnsenite-(Ce) = 96.52 barns/electron U=PE Johnsenite-(Ce) x r electron = 295.32 barns/cc. Radioactivity: GRapi = 6,454.67 (Gamma Ray American Petroleum Institute Units) Concentration of Johnsenite-(Ce) per GRapi unit = 154.93 (PPM) Johnsenite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
  • Johnsenite-(Ce) : ClassicGems.net

    www.classicgems.net/gem_johnsenite.htm Johnsenite-(Ce) is a rare cyclosilicate that is also a rare earth elements (REE) mineral. It contains eight of the fifteen lanthanide elements: lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), gadolinium (Gd), dysprosium (Dy), plus yttrium (Y).
  • Johnsenite-(Ce) Na (Ce,La,Sr,Ca, )3Ca6Mn3Zr3W(Si25O73)(CO3 ...

    www.handbookofmineralogy.org/pdfs/johnsenite-(Ce).pdf Johnsenite-(Ce) Na 12 (Ce,La,Sr,Ca, ) 3 Ca 6 Mn 3 Zr 3 W(Si 25 O 73)(CO 3)(OH,Cl) 2 Crystal Data: Hexagonal. Point Group: 3m. As deeply etched, skeletal crystals, to 4 mm and in aggregates to 1 cm; crystals display partial {0001} and {101-1}. Physical Properties: Cleavage: None. Fracture: Uneven. Tenacity: Brittle. Hardness = 5-6
  • Johnsonite CE-XX-A Snap-In Transition, 12 ft. Length ...

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