Transvaal, South Africa NB terrible confusion about numbers! Specimens M3 and M4 were moved to the gemstone collection and given Z numbers. According to the gem catalogue, Z1 was M3, and M4 became Z2. However, the actual specimen with the old M3 number, also has Z2 on it! Thus, although this specimen actually has the number Z1 on it, it is almost certainly actually M4. Aaargh!