A contribution to the separability of natural and synthetic emeralds
Author(s) : -
Date : 1982
A contribution to the separability of natural and synthetic emeralds. Published in Journal of Gemmology, 1982.
Author(s): H.A. Haenni
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Blue colour-changing kyanite from East Africa
Author(s) : -
Date : 1982
Tags : East Africa / Kyanite
Blue colour-changing kyanite from East Africa. Published in Journal of Gemmology, 1982.
Author(s): G. Bosshart, E. Frank, H.A. Haenni, N. Barot
Golden yellow tourmaline of gem quality from Kenya
Author(s) : -
Date : 1981
Tags : Kenya / Tourmaline
Golden yellow tourmaline of gem quality from Kenya. Published in Journal of Gemmology, 1981.
Author(s): H.A. Haenni
First occurence of gem sphene in Sri Lanka
Author(s) : -
Date : 1981
First occurence of gem sphene in Sri Lanka. Published in Journal of Gemmology, 1981.
Author(s): M. Gunawardene, H.A. Haenni
Cubic stabilized zirconias
Author(s) : -
Date : 1977
Tags : Cubic Zirconia
This article contains a short survey on the stability of zirconias and their growth as stable cubic single crystals, followed by physical and crystallographic data on transparent rough and brilliant-cut material. The chemical compositions of yttria-stabilitzed zirconias is verified by means of rarely used formulas.
Author(s): G. Bosshart