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A rare earth, metallic element. Praseodymium has an abundance on 6-9 ppm in the earth's crust. It is found in rare earth minerals, i.e. monazite, cerite and allonite. Praseodymium is a soft, yellowish metal that tarnishes readily in moist air to form green salts. Its salts are used as a colorants in glazes and glasses and as a components in phosphors and lasers. A zircon/praseodymium yellow is used as a stable yellow colorant up to 1280 C.

Synonyms and Related Terms



  • Sensitive to air and moisture.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Composition Pr (atomic no. 59)
CAS 7440-10-0
Melting Point 930 C
Density 6.78-6.81 g/ml
Molecular Weight atomic wt = 140.9077

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 178
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7891
  • Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992

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