Quote Originally Posted by radaddict View Post
Well, who knows what was going on when this stone was forming. There could be trace amounts of organic material that, with water added, mimics the characteristics of soap. I think some salts have detergent properties as well. As for the surface tension, soap decreases surface tension. I think bubbles will form more easily when the water's surface tension is decreased. Of course, without a detailed analysis of this particular stone, we can speculate until the cows come home and never have a definitive answer.

It would be nice to know what is causing the bubbles and if that is what gives this stone it's outstanding polishing properties. If it is some salt or organic material, perhaps we could sprinkle it on other coticules (like fairy dust) to enhance the stones performance as a hone.
Nope, its a metamorphic rock subjected to heat and pressure. No organic material would survive it without being changed into graphite or some xtlized form of carbon.