Smithson Tennant

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File:Smithson Tennant Blue Plaque.jpg
The blue plaque for Smithson Tennant in Finkle Street, Selby

Smithson Tennant FRS (30 November 1761[1] – 22 February 1815[2]) was an English chemist.

Tennant is best known for his discovery of the elements iridium and osmium, which he found in the residues from the solution of platinum ores in 1803. He also contributed to the proof of the identity of diamond and charcoal. The mineral tennantite is named after him.


Tennant was born in Selby in Yorkshire. His father was Calvert Tennant (named after his grandmother Phyllis Calvert, a granddaughter of Cecilius Calvert, 2nd Baron Baltimore). His own name derives from his grandmother Rebecca Smithson, widow of Joshua Hitchling. He attended Beverley Grammar School and there is a plaque over one of the entrances to the present school commemorating his discovery of the two elements, osmium and iridium. He began to study medicine at Edinburgh in 1781, but in a few months moved to Cambridge, where he devoted himself to botany and chemistry. He graduated M.D. at Cambridge in 1796,[3] and about the same time purchased an estate near Cheddar, where he carried out agricultural experiments. He was appointed professor of chemistry at Cambridge in 1813, but lived to deliver only one course of lectures, being killed near Boulogne-sur-Mer by the fall of a bridge over which he was riding.[4][2]


  1. Mary D. Archer; Christopher D. Haley (2005). The 1702 Chair of Chemistry at Cambridge: Transformation and Change. Cambridge University Press. p. 115. ISBN 978-0-521-82873-4.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. 2.0 2.1 J.W.C. (December 1961). "Supply and training of food technologists". Royal Institute of Chemistry. 85: 434. doi:10.1039/JI9618500429.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. "Smithson Tennant (TNNT782S)". A Cambridge Alumni Database. University of Cambridge.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. Chisholm 1911.


  •  This article incorporates text from a publication now in the public domainChisholm, Hugh, ed. (1911). [ "Tennant, Smithson" ] Check |ws link in chapter= value (help). Encyclopædia Britannica. 26 (11th ed.). Cambridge University Press.CS1 maint: ref=harv (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • Mary D. Archer, Christopher D. Haley. The 1702 Chair of Chemistry at Cambridge. Cambridge, 2005, ISBN 0-521-82873-2, ISBN 978-0-521-82873-4.
  •  Harden, Arthur (1898). [ "Tennant, Smithson" ] Check |ws link in chapter= value (help). In Lee, Sidney (ed.). Dictionary of National Biography. 56. London: Smith, Elder & Co.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • Usselman, Melvyn C. "Tennant, Smithson (1761–1815)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/27134.CS1 maint: ref=harv (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles> (Subscription or UK public library membership required.)

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