1. Crystals

2. Geologists

3. Found in minerals and have a regular geometric shape.

4. Scientist who study rocks and minerals to help us learn about the formation of the earth.

5. Granite

6. Hardness

7. Rock composed of the minerals: Quartz, Mica, and Feldspar.

8. How resistant a mineral is to being scratched.

9. Igneous rocks

10. Luster

11. Formed from minerals that have melted deep within the Earth.

12. The way a mineral reflects light.

13. Magnetic minerals

14. Metamorphic rocks

15. Minerals which show magnetic properties. Two examples are magnetite and hematite.

16. Formed from igneous, sedimentary, or other metamorphic rocks which contain minerals that have been changed by heat, pressure, or chemical action.

17. Mineral

18. Mohs Scale

19. Occur in nature and have definite chemical compositions and physical properties. They are the raw materials of rocks.

20. Used by geologists to classify a given minerals hardness.

21. Rock

22. Scratch test

23. Earth materials made up of different kinds of minerals.

24. Used to determine the hardness of a mineral.

25. Sedimentary rocks

26. Streak color

27. Formed as particles settle to the bottom of oceans and lakes.

28. When an unknown mineral is rubbed against a streak plate, (unglazed piece of porcelain) it may produce a colored line if it is softer than the streak plate.

29. Streak plate

30. Unglazed porcelain material that is used to determine the streak color of a mineral by rubbing a mineral over its surface.