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All taken from here:
http://nanofab.uwo.ca/services/sem%20imaging.html

Nakayama Asagi Surface:
http://nanofab.uwo.ca/resources/Images/SEM/NakayamaAsagi.jpg

Garnets:...

These are Rhombendodekaeders....a very Informative source is Grinding and Honing Part 1, Page 4-14....

The exact definition can be seen in the Flickr descriptions of each picture...

For Particles Size and looking of Coticules you can check back Henk Bos Grinding and Honing Part 4, Pages 65-70 SEM Pictures

http://bosq.home.xs4all.nl

Coticule Slurry Pics taken from Zeiss Flickr...

https://www.flickr.com/photos/zeissmicro/12695619165/

https://farm8.staticflickr.com/7448/12695619165_3d15bf2274_c_d.jpg
...

Slurry of a Vintage Thuringian Water Hone in comparison to Müller Thuringian (c) by Bartisto from the german Board www.nassrasur.com

Here is the thread:...