Gadolinium is a heavy lanthanoid used in many storage devices. It has a high neutron absorption which makes it useful shielding for nuclear reactors. Gadolinium also is used as a contrast agent in magnetic resonance imaging. It is produced from the minerals monazite and bastnasite.
Molycorp - http://www.molycorp.com/ - Molycorp is a mining and marketing subsidiary of Chevron (NYSE: CVX) that produces gadolinium, in addition to molybdenum and other rare earth elements. Avalon Rare Metals (TSE: AVL)
Metall Rare Earth Limited - http://www.metall.com.cn/gd.htm - Gadolinium acetate, carbonate, chloride, fluoride, hydroxide, iodide, metal, nitrate, oxalate, oxide and sulfate
Commerce Resources Corp. (CVE: CCE) - http://www.commerceresources.com/ - Upper Fir tantalum and niobium deposit in Britich Columbia, Canada and Eldor Rare Earth Project in the Labrador Trough near Kuujjuaq, Quebec.
Great Western Minerals Group (CVE: GWG)
(wiki) - Gadolinium on Wikipedia
Gadolinium News 2011-05-31 - (nw) - A coating for jet engines to prevent volcanic ash damage
2011-05-20 - (dl) - Limiting gadolinium use may avert renal systemic fibrosis
2010-11-09 - (eiq) - MRI tech aided by silicon microparticles, gadonanotubes
2010-11-02 - (run) - Clinicians react to FDA's gadolinium warnings
2010-10-14 - (rsc) - Nano-refrigerators
2010-08-16 - (ls) - FDA to look at gadolinium-based contrast agent, known for MRI health risks
2010-08-13 - (jcmr) - Myocardial late gadolinium enhancement cardiovascular magnetic resonance in patients with cirrhosis