Fourth grade

Science                                                             1396/10/19

Lesson 15              More about Minerals

Minerals can be understood by their hardness.

Pyrite: fool' gold.

Pyrite looks like gold.

Comparing of Gold and Fool's gold:

1.            Gold leaves yellow line on porcelain. But fool's gold leaves black line on porcelain.

2.            Gold and fool's gold are yellow.

3.            Gold is heavier than fool's gold.

4.            Gold and fool's gold are metallic.

5.            Gold and fool's gold are opaque.