14 February (Zaire ) within release Minerals from Zaïre goes into circulation Stamp Uranium & pitchblende face value 1 Zairean zaire
Stamp Uranium & pitchblende in catalogues | |
---|---|
Michel: | Mi:CD 806 |
Yvert et Tellier: | Yt:CD 1123 |
Belgium: | Bel:CD 1184 |
Stamp is horizontal format.
Also in the issue Minerals from Zaïre:
Stamp Uranium & pitchblende it reflects the thematic directions:
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form