| Popis: |
The selective attack of meteoritic minerals by chlorine has been used to reveal structures, formed during prolonged extra-terrestrial cooling, in certain iron meteorites. Several minerals, including low-nickel metal (kamacite), iron sulphide (troilite) and chromite (Reichenbach lamellae), are preferentially corroded by chlorine at 350°C, leaving other minerals suitably for examination by the scanning electron microscope and the electron microprobe. Information on elemental distribution in relation to topography has been obtained over the boundary of a plessite (a fine-grained intergrowth of kamacite and taenite) and also for kamacite with its associated schreibersite which enclosed Reichenbach lamallae. |
