| 1. | Shale | PA |
| 2. | Limestone | PA |
| 3. | Shale with fossils from St. Clair Strip Mines (closed), Carboniferous Period | PA |
| 4. | Mudstone (on the way to being shale) | NE PA |
| 5. | Sandstone with volcanic ash pockets | |
| 6. | Coal – Anthacite (lightweight, but dense) | PA |
| 7. | Quartzite | |
| 8. | Phyllite | Vermont – along roadside |
| 9. | Rose Quartz | S. Dakota |
| 10. | Copper Rock | AZ |
| 11. | Pyrite (Fool’s Gold) | CO |
| 12. | Selenite – variety of gypsum | AZ/UT border |
| 13. | Apache Tears – Obsidian | AZ |
| 14. | Limestone | |
| 15. | Granite | |
| 16. | Sandstone with Quartz crystal capstone | |
| 17. | Granite with Pegmetite | |
| 18. | Pyrite – Fool’s Gold |
| 19. | Granite – “Belgium Rock” ballast (contains Quartz & Feldspar) | |
| 20. | Tuff (Tufa) | |
| 21. | Marble | |
| 22. | Schist (Metamorphic Sandstone) |
| 23. | Mica Schist (?) | Wissahickon |
| 24. | Gneiss | Wissahickon |
| 25. | Mica – Biotite (dark), Moscovite (light) |
| 26. | Rose Quartz | |
| 27. | Smoky Quartz | |
| 28. | Amethyst (Quartz) | |
| 29. | Hematite (“Blood-like streak” – source of iron ore) | |
| 30. | Serpentine | David Packer Ranch, Big Sur, CA |
| 31. | Pyrite | San Pedro Mine, Santa Fe Co., NM |
| 32. | Chert (Flint) | North Sea Coast, Fyn, Denmark |
| 33. | Sandstone with Mica | |
| 34. | Sandstone (with Quartz Crystal outcropping) | |