Boltwoodite (different formula)
56%
| Country: | South-West Africa |
|---|---|
| Issue: | Minerals |
| Date: | 1990-10-25 |
| Print: | Offset and Lithography |
| Perforation: | Unknown 14½ x 14 |
| Emission: | Definitive |
| Format: | Stamp |
| Face Value: | 18 South African cent |