Dioptase crystals (Angola 1970)

31 October (Angola ) within release Geology, mineralogy, paleontology goes into circulation Stamp Dioptase crystals face value 1.50 Angolan escudo

Stamp Dioptase crystals in catalogues
Michel:	Mi:AO 565
Stamp Number:	Sn:AO 553

Stamp is square format.

Also in the issue Geology, mineralogy, paleontology:

• Stamp - Angolasaurus Bocagei Ant. face value 50;
• Stamp - Ferrometeorite face value 1;
• Stamp - Dioptase crystals face value 1.50;
• Stamp - Gondwanidium face value 2;
• Stamp - Diamonds face value 2.50;
• Stamp - Estromatólitos Humpata face value 3;
• Stamp - Procarcharodon Megalodon L. face value 3.50;
• Stamp - Microceratodus Angolensis Teix face value 4;
• Stamp - Muscovit face value 4.50;
• Stamp - Mineral: Barite face value 5;
• Stamp - Nostoceras face value 6;
• Stamp - Rotula orbicolus face value 10;