???????????(Wulff net)

1
2. ?????

• ??????
• ???????????
• ???????????(Wulff net)
• ????????

2
???????
???????

• Stereographic Projection want to represent 3-D
  crystal on 2-D paper

3
??????
???????

• ?????? (law of Steno) ??????, ???????????
• ?????? a, b, c ?
• ??
• ?????

4
???????(spherical projection)
???????

• ?????????,??????,???????????(????????????????),?
  ???????,???????????,????????????????
• Planes now points
• But still 3-D!

5
????
???????

• Similar to ??????(???????)
• ???(??) j 0 360?
• ???(??) r 0 180?, ?????
• ?M????

6
??????
???????

• ??????????,???(S)???,?????????????
• ????A???S,??????a
• now 2-D !!

7
??????
???????

• ????
• ??????
• ??????

8
??????
???????

• ?????

Fig 6.5 of Klein (2002) Manual of Mineral
Science
Fig 6.5 of Klein (2002) Manual of Mineral
Science
9
????(Wulff net)
???????

• ?????????
• ??
• j ???E
• r ??????

10
????(crystal goniometry)
???????
11
????????
???????
????M????r 30º?j 40º,?M???????
12
????????
???????
???????M (r1, j1)?P(r2, j2),????????
13
???
???????