Mammoth Ivory comes in several types. Mammoth Tooth is terribly unstable and is unsuitable for gun grips or knife handles, except for those which you do not intend to use. On the other hand, Mammoth Tusk Ivory is quite a bit more dense than Elephant Ivory. You have bark Ivory, which is the exterior of the tusk, which exhibits grain, sometimes Stag-like texture and, of course, cracks. Bark Ivory can be stabilized quite easily with epoxy (usually mixed with Ivory dust). As long as the Bark Ivory has nothing more than superficial grain cracks, it can be used as 1911 grips, and are fairly durable. The interior Tusk Ivory is completely different. When finished it has a smooth buttery feel, is gorgeous and very durable. I have 4 1911s with interior Tusk Ivory grips that I have shot extensively over the past 3-4 years without any problems whatsoever. I also have a very large Bowie style camp knife with Bark Ivory scales that gets used every hunting season to cut firewood, quarter elk and deer, and whatever else comes along. I have used and abused this knife for 5 or 6 years and have had no problems with the Bark Ivory. If you use the Russian Mammoth Ivory that has been preserved in the permafrost, you won't have any problems with your beautiful Mammoth Ivory grips. Enjoy them. I know I have.