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John Barry Hawthorne

John Barry Hawthorne, South African geologist and entrepneur (Kimberley, Northern Cape Province 19 May 1934 – Scarborough, Cape Town 15 November 2018)

Gave relevant contributions to kimberlite geology, diamond studies and upper mantle geology

Showed that kimberlites were undoubtedly magmas

With J.B. Dawson. Magmatic sedimentation and carbonatitic differentiation in kimberlite sills at Benfontein, South Africa. J. Geol. Soc. 129(1):61-85, 1973

With J.W. Harris, M.M. Osterveld & E. Wehmeyer. A classification scheme for diamond, and a comparative study of South African diamond characteristics. Phys. Chem. Earth 9:765-83, 1975

Proposed the composite geological model for many southern African pipes

Model of a kimberlite pipe. Phys. Chem. Earth 9:1-15, 1975


With C.R. Clement, J.W. Harris & D.N. Robinson. The DeBeers kimberlite pipe – a historic South African diamond mine. Mineral Deposits of Southern Africa. Geol. Soc. South Afr. 2:2193-2214, 1986 

With J.W. Harris & M.M. Osterveld. A comparison of diamond characteristics from the DeBeers Pool mines, Kimberley, South Africa. Ann. Sci. Univ. Clermont-Ferrand 2(74):1-13, 1984

With A.J. Carrington, C.R. Clement & E.M.W. Skinner. Geology of the Dokolwayo kimberlite and associated paleo-alluvial diamond deposits (1979)

With J.W. Harris & M.M. Osterveld. Regional and local variations in the characteristics of diamonds from some Southern African kimberlites (1979)

With C.R. Clement, E.M. Skinner, L. Klenjan & H.L. Allsopp. Precambrian ultramaffic dykes with kimberlite affinities in the Kimberley area. (1975)

With J.B. Dawson. Intrusion features of some hypabyssal South African kimberlites. Bull. Volcan. 34 (3):740-57, 1970

Kimberlite sills. Trans. Geol. Soc. S. Afr. 71:291-311, 1968


Hawthorneite Grey, Madsen & Haggerty 1987 (Mineral)