Collection of 20 rocks and minerals with magnifying glasses

MACHINE TRANSLATION (not authorised yet)

The collection - a teaching aid, allows for the presentation of basic types of rocks and minerals (a total of 20 rock fragments). The specimens are placed in foam, and the collection comes with a list of rocks and minerals and three unbreakable magnifying glasses with 3x and 6x magnification, which makes it possible for several people to use the set at the same time.

Contents:

1 BASALT 2. GRANITE 3. PUMICE 4. GNEISS 5. MARBLE 6. QUARTZITE 7. SERPENTINE 8. COAL 9. LIMESTONE 10. SANDSTONE 11. AGATE 12. CALCITE 13. DOLOMITE 14. FELDSPAR (SPINEL) 15. GRAPHITE 16. GYPSUM 17. MAGNETITE 18. PYROPHYLLITE 19. QUARTZ 20. TOURMALINE