1. Liz LaRosa http://www.middleschoolscience.com 2009
Rock identification
Liz LaRosa
2009

2. What type of rock is this? Where or how is it formed?

3. Marble Metamorphic Non-Foliated Calcium Carbonate
Metamorphism of Limestone

4. What type of rock is this? Where or how is it formed?
Image Source

5. Limestone Sedimentary Calcium Carbonate
Forms in clear, warm, shallow marine waters
Forms from the accumulation of shell, coral, algal and fecal debris

6. What type of rock is this? Where or how is it formed?

7. Granite Intrusive Igneous Rock Most are Felsic
Coarse Grained, can see crystals
Contains quartz and feldspar

8. What type of rock is this? Where or how is it formed?

9. Gneiss
Metamorphic
Foliated
Feldspar

10. What type of rock is this? Where or how is it formed?
Image Source

11. Coal
Organic Sedimentary Rock
Formed from plant remains

12. What type of rock is this? Where or how is it formed?

13. Obsidian Extrusive Igneous Rock Very quick cooling molten rock (lava)
Glassy
No crystals formed

14. What type of rock is this? Where or how is it formed?
Image Source

15. Sandstone Sedimentary Rock
Formed by the action of wind, water, and ice on older rock
Quartz cemented by silica or lime
Most form in shallow seas

16. What type of rock is this? Where or how is it formed?

17. Pumice Felsic Extrusive Igneous Rock Quick cooling molten rock (lava)
No crystals formed
Many holes formed - gasses released
Floats on water

18. What type of rock is this? Where or how is it formed?

19. Scoria Mafic Extrusive Igneous Rock
Forms as a frothy crust on the top of a lava flow or as material ejected from a volcanic vent and solidifying while airborne
No crystals formed
Many holes formed - gasses released

20. What type of rock is this? Where or how is it formed?

21. Basalt Mafic Extrusive Igneous Rock Formed from dark dense lava
Pyroxene, plagioclase feldspar
Fine grained

22. What type of rock is this? Where or how is it formed?

23. Slate Foliated Metamorphic Rock Metamorphism of Shale
Breaks into thin “slices”

24. What type of rock is this? Where or how is it formed?

25. Hornfels Non-Foliated Metamorphic Rock Fine grained crystals
Metamorphism of clays or shales

26. What type of rock is this? Where or how is it formed?

27. Conglomerate Sedimentary Rock
Rounded pebbles ¼ inch or larger cemented together
Formed near moving water
Quartz, quartzite

28. Review Can you compare and contrast the following sets of rocks?
Limestone and Marble
Granite and Gneiss
Obsidian and Coal
Sandstone, Pumice, and Scoria
Basalt, Hornfels, and Slate
Conglomerate and all the other rocks