Novaculite is a compact quartzose rock of all most pure silica content. The technical advantages of the natural Arkansas oil stone are derived from the crystalline structure of individual quartz grains comprising more than 99% of novaculite rocks. Voids and exposure of crystalline edges enhance the sharpening ability of this natural abrasive. Also I am not denigrating anyone who chooses to do what ever they want with their stone. I personally choose not to alter my things they work fine the way they were when they came into my possession.