1. Igneous Extrusive No Crystals
Obsidian
Igneous
Extrusive
No Crystals

2. Igneous Extrusive Density less than 1 g/cm³
Pumice
Igneous
Extrusive
Density less than 1 g/cm³

3. Igneous Extrusive Small Crystals
Basalt
Igneous
Extrusive
Small Crystals

4. Igneous Intrusive Large Crystals
Granite
Igneous
Intrusive
Large Crystals

5. Sedimentary Clastic Sand size particles
Sandstone
Sedimentary
Clastic
Sand size particles

6. Sedimentary Clastic Large particles
Conglomerate
Sedimentary
Clastic
Large particles

7. Sedimentary Organic From living organism (coral)

8. Sedimentary Organic From the remains of animal shells
Limestone
Sedimentary
Organic
From the remains of animal shells
Color ranges from pinkish (shown) to green-brown

9. Metamorphic Unfoliated Formed from Sandstone
Quartz
Metamorphic
Unfoliated
Formed from Sandstone

10. Metamorphic Unfoliated Formed from Chalk
Marble
Metamorphic
Unfoliated
Formed from Chalk

11. Metamorphic Foliated From Granite
Gneiss
Metamorphic
Foliated
From Granite

12. Metamorphic Foliated Basalt
Schist
Metamorphic
Foliated
Basalt

13. Metamorphic Foliated Formed from shale
Slate
Metamorphic
Foliated
Formed from shale

14. Sedimentary Clastic Formed from mud or wet soil
Shale
Sedimentary
Clastic
Formed from mud or wet soil

15. Sedimentary Organic Formed from the remains of pine trees
Coal
Sedimentary
Organic
Formed from the remains of pine trees

16. Sulfur
Medicine
Explosives

17. Used in lead production
Galena
Used in lead production

18. Hematite
Used in pigments

19. Used in pencils as a streak Used as a lubricant
Graphite
Used in pencils as a streak
Used as a lubricant

20. Building materials Medicine
Calcite
Building materials
Medicine

21. Talc 26% of talc is used in the production of plastics
0-1 on MOHS hardness scale