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Gagarinite-(Ce)

Coordinates: 56°20′N 64°10′W / 56.333°N 64.167°W / 56.333; -64.167 (Zajacite-(Ce) discovery)
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This is an old revision of this page, as edited by Vsmith (talk | contribs) at 23:51, 3 November 2012 (Vsmith moved page Zajacite-(Ce) to Gagarinite-(Ce): mineral renamed in 2010 by IMA). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Zajacite or Zajacite-(Ce) is a rare radioactive fluoride mineral with formula: Na(REExCa1-x)(REEyCa1-y)F6. REE refers to rare earth elements, mostly those belonging to the lanthanide series. It crystallizes in the trigonal - rhombohedral system and has a white vitreous appearance with a conchoidal fracture. It has a Mohs hardness of 3.5 and a specific gravity of 4.44 to 4.55. Zajacite is transparent with refractive indices of nω=1.483 and nε=1.503 and occurs as creamy to white grains and phenocrysts in pegmatite and aplite pods or lenses in a peralkaline igneous intrusion.

It was discovered in 1993 at Strange Lake, Quebec - Labrador, (56°20'N, 64°10'W) and was named for Dr. Ihor S. Zajac, who led the expedition responsible for its discovery, and who first recognized the presence of the new mineral.

See also

References

56°20′N 64°10′W / 56.333°N 64.167°W / 56.333; -64.167 (Zajacite-(Ce) discovery)


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