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From what I can see from your photos it looks like a natural odd looking rock It does not appear to show any signs of being a fossil bone. It may look like it, but it is just an odd looking rock.
That hard shell is called a cortex, it happens when the outer layer of rock becomes weathered and exposed to the elements, since you can't scratch it, most likely it's not pipestone, it's an igneous rock, feldspar rich (gives it the red) Cali is loaded with igneous stuff, Sierra's etc.