William Alexander "Alex" Deer FRS (26 October 1910 – 8 February 2009) was a British geologist.
Dear was Professor of Mineralogy and Petrology at the University of Cambridge from 1961, Master of Trinity Hall from 1966 to 1975, and Vice-Chancellor of Cambridge University from 1971 to 1973.
He was an editor, along with Robert Andrew Howie and Jack Zussman, of the reference work Rock-Forming Minerals and the abridged version, An Introduction to the Rock-Forming Minerals. The mineral deerite (IMA 1964-016) was named in his honour.
- Deer, William Alexander; Wager, Lawrence Rickard (1939). "Olivines from the Skaergaard Intrusion, Kangerdlugssuak, East Greenland" (PDF). American Mineralogist. 24: 18–25.
- Deer, William Alexander; Howie, Robert Andrew; Zussman, Jack (1962). Rock-forming Minerals. Wiley. Note: 5 volumes
- Deer, William Alexander; Howie, Robert Andrew; Zussman, Jack (1992). An Introduction to the Rock-Forming Minerals (2 ed.). London: Longman. ISBN 0-582-30094-0.
- Deer, William Alexander; Howie, Robert Andrew; Zussman, Jack (2009). Rock-forming Minerals. Geological Society. Note: 11 volumes
- "William Alexander Deer, 1910-2009". The Geological Society. Retrieved 20 October 2014.
- Obituary in The Times
- Agrell S O, Bown M G, McKie D (1965). "Deerite, howieite, and zussmanite, three new minerals from the Franciscan of the Laytonville District, Mendicino Co., California". American Mineralogist. 50: 278-278.CS1 maint: uses authors parameter (link)
| Master of Trinity Hall, Cambridge
Theodore Morris Sugden
| Vice-Chancellor of the University of Cambridge
John Wilfrid Linnett
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