Does anyone have any experience with these natural stones ?I was googling around trying to find sites or blogs about natural whetstones and was reading about these that are like a sandstone with soccer ball shaped garnets that cut and polish.The Coticle is a yellow color and has a higher percentage of garnets than the Blue.The straight razor folks love them.I like natural stones and even though my DMT hones and Norton Fine and coarse Indias are all I really need I like rare and odd stones and buy them when I can afford them.I would appreciate any input from those who have used these or links to any blogs or sites about natural hones.The razor and woodworking folks are where I have found lots of info.Thanks