Hi Willi, JD Ball et al. (1996): RCM 10, 987 (Table 1 p. 988) listed the elemental composition of NBS 19 as "Ca0.98Mg0.02CO3" (determined by X-ray diffraction). Greetings Roland Willi A. Brand wrote: > I have been trying to find information about the elemental composition > of NBS-19 and other calcites like IAEA-CO1 without a lot of success. Can > someone push me in the right direction? > Willi > > -- > ..................................................................... > > Willi A. Brand, Stable Isotope Laboratory [log in to unmask] > > Max-Planck-Institute for Biogeochemistry > > Beutenberg Campus > Hans-Knoell-Str. 10, 07745 Jena, Germany Tel: +49-3641-576400 > P.O.Box 100164, 07701 Jena, Germany Fax: +49-3641-57-70 > > http://www.bgc-jena.mpg.de/ > http://www.bgc-jena.mpg.de/service/iso_gas_lab/ > > .....................................................................