Grit particle shape - photomicrographs?

Over in the world of woodworking a question has been asked about the effect
of grit particle shape on sharpening action.

Does anyone here know of (or have) images
of the actual particle shapes for various abrasives?

(waterstones, coticules, arkansas, India, slates, diamonds
would all be of interest)

BugBear

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:
http://forum.nassrasur.com/showtopic...id=12555&time=

And pics (left müller waterhone thuringian, right vintage one):
http://www.bilder-hochladen.net/files/4aer-2w.jpg

Coticule Slurry Pics taken from Zeiss Flickr...

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

https://farm8.staticflickr.com/7448/...bf2274_c_d.jpg

https://www.flickr.com/photos/zeissmicro/12695616385/

https://farm8.staticflickr.com/7434/...915e7b_c_d.jpg

There are more to find!!

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

The coticule photos show not particles but the garnet xtls. They look like dodecahedrons to me.

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...

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

Nakayama Asagi Surface:
http://nanofab.uwo.ca/resources/Imag...ayamaAsagi.jpg

Garnets:
http://nanofab.uwo.ca/resources/Imag...garnets_07.jpg

Garnet in Mica:
http://nanofab.uwo.ca/resources/Images/SEM/coticule.jpg