Interesting muscovite specimens from Pakistan: epitaxial incrustation and pseudomorphism after beryl. Published in the Journal of the Gemmological Association of Hong Kong (2010).
Author(s): M.S. Krzemnicki
Asterism in beryl, aquamarine and emerald- an update. Published in Journal of Gemmology, 2004.
Author(s): K. Schmetzer, L. Kiefert, H.A. Haenni
Pezzottaite, a new mineral and gem. Published in Journal of Gemmology, 2004.
Author(s): H.A. Haenni, M.S. Krzemnicki
Der Binntal Smaragd als Juwel. Published in Schweizer Strahler, 2003.
Author(s): M.S. Krzemnicki, G. Bosshart
Blue-green emerald from Nigeria (a consideration of terminology). Published in Australian Gemmologist, 1992.
Author(s): H.A. Haenni
The case for blue-green emerald. Published in Jewellery News Asia, 1991.
Author(s): H.A. Haenni
Edelsteine der Beryl-Gruppe. Published in Schweizerische Uhrmacher- und Goldschmiede-Zeitung, 1989.
Author(s): H.A. Haenni