five rock specimens
Stato: Guinea Anno: 1999 Notizie: In 1999 the Republic of Guinea may have issued a miniature sheet showing an apatosaurus and five rock specimens against a volcanic background. The rock specimen in the middle of the bottom row is an iron meteorite, a fine octahedrite. Perhaps the best known examples of fine octahedrites are specimens from the Gibeon meteorite shower which fell in prehistory in Namibia. The other four rock specimens depicted are crystalline shale (upper left), limestone containing fossils (lower left), tonalite (lower right), and heterosite (upper right). |
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