Quartz from selected localities.
Belgium | |
| Frank de Wit collection |
Netherlands | |
| findings Frank de Wit |
| Buurman et al (1975) in 'Geologie en Mijnbouw' |
Belgium | |
| Frank de Wit collection |
Netherlands | |
| findings Frank de Wit |
| Buurman et al (1975) in 'Geologie en Mijnbouw' |