98 - Californium

Green crystal of californium bromide CfBr3(1)

About 20 micrograms as a circular spot plated on a platinum disk.  (2)

The first pure californium compound, 0.3 micrograms of californium-249 oxychloride (CfOCl), isolated in 1960. 
The crystals are lodged in a capillary tube.  (3)

Californium metal (5 mg of Cf-249).  (4)

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1 - http://www.chemie-master.de/.  Photo credited to A. Kronenberg, http://www.kernchemie.de/.
2 - "Matter", Ralph E. Lapp and the editors of LIFE, LIFE Science Library.  A newer edition than 1965, I don't know which year.
3 - "Man-Made Transuranium Elements", G. T. Seaborg, Prentice-Hall, 1963.  The 1965 Life book also used this picture.
4 - R. G. Haire, "Preparation of transplutonium metals and compounds", p 309-342, printed in "Actinides in Perspective", N.M. Edelstein ed., Pergamon Press, 1981.  Thanks to David Keim for the reference.
5 - In J. Emsley, "Nature's Building Blocks", Oxford Press, 2001, it is stated that californium metal has yet to be prepared.  This appears to be incorrect.
6 - An Application by Kodak in analysis of impurities in chemicals.