What Do Colors and Shapes Represent in Stereographic Projections?

[scott_alexsk]

Hello,

Can anyone tell me what the triangles, squares, and ovals mean in the projection on page 19? Does this have something to do with the directions for the third axis? On the next page several of the symbols are black. What significance does this have, also?

Thanks
-scott

"[PLAIN 19"]http://neon.mems.cmu.edu/rollett/27750/L19A_Single_Xtal_Aniso1_3Apr06.ppt#317,19,Slide 19[/URL]

 

[Dr Transport]

They indicate symmetries of the lattice, ie a square is a 4-fold rotation, triangle a 3-fold rotation etc...

 

[charng]

Hello Scott,

The triangles, squares, and ovals in the stereographic projection are symbols used to represent specific crystallographic directions. These symbols are known as Miller indices and they are used to label crystal faces and directions in a crystal structure. The third axis in the projection represents the direction perpendicular to the plane of the projection, and the symbols indicate the orientation of the crystal in three-dimensional space.

On the next page, the black symbols represent specific crystallographic planes. In stereographic projections, different colors or shades are often used to differentiate between different crystallographic planes or directions. This can help to visually distinguish between different crystallographic features and aid in understanding the orientation of the crystal.

I hope this helps to clarify the symbols in the projection. If you have any further questions, please don't hesitate to ask.