I will soon put some rare stones on my Website. In order to
carry out my project, I'm looking for precise
(crystal system, chemical composition, color, hardness, specific
gravity, refractive index, dispersion and pleochroism) concerning
the following stones : Bytownite, Clinohumite, Ekanite,
Eosphorite and Jeremejevite.
I know that it is not an easy question. So, is there such an
expert out there ?