1. 1-1 Faulted rhyolitic obsidian from Hrafntinnuhryggur, Krafla, Iceland, 25 ka.

2. 1-2 Andesitic peperite, Honister, Cumbria, ~450 Ma.

3. 1-3 Mule Creek pyroclastic breccia with lithic clasts, New Mexico, 19 Ma

4. 1-4 Sheared crystalline dacite lava, Unzen lava spine, Unzen, Japan, 1994

5. 1-5 Trachyandesitic ash, Eyjafjallajokull, April 2010

6. 1-6 Rhyolitic peperite from Torfajokull, Iceland, 70 ka

7. 1-7 Andesite lava from Montserrat, West Indies with tuffisite vein

8. 1-8 Andesite lava bomb with breadcrust textures from Montserrat, West Indies

9. 2-1 Bezymianny (andesitic lava dome, Kamchatka) 2004

10. 2-2 Hrafntinnuhryggur obsidian with fractured crystalline flow bands (rhyolite, 25 ka)

11. 2-3 Hrafntinnuhryggur obsidian with spherulites and lithophysae (rhyolite, 25 ka)

12. 2-4 Tip of basaltic dyke (Öraefajökull, Iceland) (age unknown)

13. 2-5 Ropy pahoehoe from Gaesafjoll, Iceland (basaltic, <10 ka)

14. 2-6 Phenocryst-rich rhyolitic obsidian from Torfajokull, Iceland (rhyolite, 95 ka)

15. 2-7 Crystalline dacite lava, Unzen lava spine, Unzen, Japan, 1994

16. 3-1 Bishop tuff pumice, Long Valley, California (rhyolite, 0
3-1 Bishop tuff pumice, Long Valley, California (rhyolite, 0.8 Ma, 700 km3)
700 km3

17. 3-2 Hrafntinnuhryggur obsidian – collapsed foam textures (rhyolite, 25 ka)

18. 3-3 Little Glass Mountain obsidian, Medicine Lake, USA (rhyolite, <1 ka)

19. 3-4 Glassy basaltic pillow rind, Kalfstindar, Iceland (~15-20 ka)

20. 3-5 Etna lava (basalt)

21. 3-6 Basaltic bomb, Torfajökull, Iceland (<10 ka)

22. 3-7 Rhyolitic bomb, Puyehue, Chile (2011)

23. 3-8 Rhyolitic columnar joint, Torfajökull, Iceland (70 ka)