Quartz "Agate" SiO2, Brasil
The picture shows the infiltration's canal with the successive chalcedony layers with more or less iron oxides.
Photo and coll. P. Perroud
(now in NHM Geneva).
A T H E N A |
Quartz "Agate" SiO2, Brasil
The picture shows the infiltration's canal with the successive chalcedony layers with more or less iron oxides.
Photo and coll. P. Perroud
(now in NHM Geneva).