Old photographs related to mineralogy and/or crystallography

Professor at the university of Liège and said to be "the father of Congolese mineralogy" (buttgenbachite).
The photograph (173 x 325 mm) is dedicated: "à Mr Mélon en souvenir de 25 années de collaboration - H. Buttgenbach"
(by courtesy of Professor A.-M. Fransolet, ULg)

Professor of mineralogy and crystallography at the university of Liège (cesàrolite)
The photograph is dedicated: " à H. Buttgenbach - Souvenir cordial. - G. Cesàro - 24 juillet 1923"
(by courtesy of Professor A.-M. Fransolet, ULg)

Professor at Yale College and author of (ia) the System of mineralogy (danaite)
The photograph (195 x 29 mm) is dedicated on a visiting card: "To Professor G. Cesàro with the esteem and respect of Edward S. Dana - oct. 29. 1923"
(by courtesy of Professor A.-M. Fransolet, ULg)

Professor of mineralogy at the museum national d'histoire naturelle (Paris) and secretary of the French académie des sciences (lacroixite)
The photograph is dedicated: "à mon ami Cesàro - affectueux souvenir - A. Lacroix"
(by courtesy of Professor A.-M. Fransolet, ULg)

the following geologists are depicted: Maximilien Lohest (1857-1926), Henri Forir (1856-1907), Paul Fourmarier (1877-1970), Pierre Destinez (? - 1911).
Minerals named after these geologists are lohestite, fourmarierite, destinezite.
size of the photograph: 280 x 217 mm
photographer: J. Berger, 47-49 rue du Pot d'Or à Liège
(photographed before 1907)