1. Petrographic microscoope and SEM images of flat-polished thin sections of chert / carbonate chert immersed in various solutions analogous to ASTM C 289

2. Control NaOH KOH Ca(OH) 2 K-Ac K-Ac & Ca(OH) 2 Plane polarized transmitted light images

3. Control NaOH KOH Ca(OH) 2 K-Ac K-Ac & Ca(OH) 2 Crossed polarized transmitted light images

4. Control NaOH KOH Ca(OH) 2 K-Ac K-Ac & Ca(OH) 2 Epifluorescent images

5. Control NaOH KOH Ca(OH) 2 K-Ac K-Ac & Ca(OH) 2 Elemental maps for silicon

6. Control NaOH KOH Ca(OH) 2 K-Ac K-Ac & Ca(OH) 2 Elemental maps for sodium

7. Control NaOH KOH Ca(OH) 2 K-Ac K-Ac & Ca(OH) 2 Elemental maps for potassium

8. Control NaOH KOH Ca(OH) 2 K-Ac K-Ac & Ca(OH) 2 Elemental maps for calcium

9. SEM images of powder mounts of chert / carbonate chert immersed in various solutions analogous to ASTM C 289

10. Control

11. NaOH

12. KOH

13. Ca(OH) 2

14. K-Ac & Ca(OH) 2

15. K-Ac