James Apjohn

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James Apjohn
Born (1796-09-01)1 September 1796
Sunville, Limerick Ireland
Died 2 June 1886(1886-06-02) (aged 89)
Southill, Blackrock Ireland
Residence Ireland
Nationality Irish
Institutions Trinity College, Dublin
Alma mater Trinity College, Dublin

James Apjohn (1 September 1796 – 2 June 1886) was the Irish chemist known for the discovery of new minerals.


Apjohn studied at Trinity College, Dublin medicine, gaining an M.B. in 1822.

About 1824 he was appointed lecturer for chemistry at a medical school in Dublin and in 1839 was awarded the Cunningham Medal of the Royal Irish Academy for his work on the Specific Heats of Gases. In 1850 he was appointed professor for chemistry at Trinity College, although he had been professor for Geology at the University since 1841.

He discovered several new minerals apjohnite and jellettite.