I have been kicking around the idea of making a list of natural stones with an effective grit RANGE associated with them and maybe a few defining characteristics for each.....

My biggest problem is the fact that although I LOVE natural stones, I don't own many and I'm a poor judge of a stone's grit...which is why I started researching the grit comparison in the first place!

For example, I have seen the Coticule being listed as similar to an 8K hone, but others say maybe 6K for their particular stone and some say the edge they get is closer to 10K....so I was thinking of going with something like this...


Stone Name/Type - Minimum grit seen - Max grit seen - Water or Oil - Origin

Coticule - 6000 - 10000 - Water - Belgium


Any thoughts on ways to change and improve the list?
How about helping with the grit ranges?


Here are the stones I have on the list so far...

Yellow Coticule
Belgian Blue
Thuringian
Charnley Forest
Cutler's Green
Water of Ayr
Tam O'Shanter
Dalmore Blue
Dalmore Yellow
Welsh Dragon's Tongue
Chinese Guangxi Hone
Queer Creek Stone
Roszutec
BM 6000
Schwedenstein
Silk Stone
Jasper
Chert
Flint
Obsidian
Jade
Wästikivi
Beryl
Soft White Arkansas
Hard White Arkansas
Hard Black Arkansas
Translucent Arkansas

Any suggestions would be appreciated!