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Hello. I found this rock in a creek of the Feather River Canyon in Northern Callifornia. It's an area known for its granite formations and serpentine outcrops. This rock was definatly out of place with nothing similar in the area. It weighs 1.25lb or .57kg. No reaction to vinager. Any ideas on what it is would be appreciated. Thank you!

MORE PHOTOS ADDED LOWER IN THE THREAD!! Hello all- After a week of extensive searching/investigating, I am still clueless and need your help! What I know: - It is mostly rock-hard and very smooth to the touch with many indentions resembling veins or roots. However, the immediate location where the tooth is attached looks and feels like bone (not fossilized). The underside is rough and prickly. - There are numerous cavities running down into the specimen an inch or two. The sides of the cavities have ridges that run lengthwise and appear somewhat porous. - I do not know exact weight as of yet, but for now let's just say it weighs what you would expect a typical rock that size to weigh. - This was recently acquired from a family member who picked it up without much thought over 25 years ago- I am still trying to determine exactly where it was found, but believe it may be central Texas (surface find). - On a side note, and obviously take this with a HUGE grain of salt, this family member claims that it was once x-rayed by a vet who believed the "mass" most resembled a brain as evidenced by "brain folds" apparent in the xray. I am still looking for those x-rays! Any takers? I took plenty more photos if needed!