4 types of crystalline solids

20:42

7:24

7:47

4:35

16:06

10:45

14:50

26:49

2:51

15:47

3:34

20:19

11:48

7:59

7:02

9:18

13:49

23:51

12:46

30:27

1:07:14

5:40

3:28

16:04

19:10

48:06

8:32

11:24

16:53

16:54

23:11

7:15

9:59

2:39

12:17

2:02

8:37

3:17

20:13

5:07

4:56

2:52

5:37

4:00

00:32

8:54

11:40

29:13

10:08

32:39

00:32

3:34

54:55

31:06

9:02

5:10

3:42

8:59

54:37

10:54