Minerals Make Rocks!!!

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. -naturally occurring solid that has a definite chemical composition and an orderly crystal structure.

2. Inorganic means !!! Rocks were never alive!

3. Magma-hot rock beneath the Earth’s surface

4. Silicate-minerals that contain and . Silicates form the minerals on earth.

5. Minerals are made of one or more .

6. -Gold, and copper are elements that occur in nature in relatively pure form. They are and minerals.

7. Silicates are the most minerals on earth.

8. -mineral found in more rocks than any other.

9. Five physical properties of minerals are: , luster, streak, , and fracture.

10. The gravity of a mineral is the ratio of its compared with the weight of an equal volume of

11. Gold has a specific gravity of 19. that means that if you have an equal amount of water and of gold, the is heavier than the water. Iron pyrite is only 5 times heavier than water.

12. Hardness measures how easily a mineral can be .

13. Hardness is expressed in from 1 to 10.

14. created a scale called the Mohs scale that lists the hardness of ten minerals. Talc is the softest and are the hardest.

15. describes the way a mineral reflects . It can be or nonmetallic.

16. Streak-the color of the from a mineral. Rub a mineral across a and look at the color left behind.

17. Streak plate is a piece of that is used to test the streak of a mineral. There is also a streak plate used to test light colored minerals.

18. Streak is more than looking at the color because minerals change color on the .

19. Cleavage-is how the minerals will break along very smooth, surfaces.
Mica has excellent cleavage.

20. Fracture-some minerals will break with uneven, , or jagged surfaces.

21. Quartz has because it breaks unevenly.

22. Calcite has because it breaks along smooth lines.

23. Special properties- a few minerals are , a few will glow in the dark, and a few give off radiation.

24. is the softest mineral, it can be scratched with your fingernail
are the hardest, they can only be scratched by another diamond.

25. 98 percent of the Earth’s crust is composed of only , oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium. Oxygen and silicon make up the most, over 74%.