"Collagen is the major protein component of the connective tissue of vertebrates; it constitutes about 25% to 35% of the total protein in mammals. Collagen molecules have remarkably diverse forms and functions. For example, collagen in tendons forms stiff, ropelike fibers of tremendous tensile strength; in skin, collagen takes the form of loosely woven fibers, permitting expansion in all directions."
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Pictoral abstract showing the use of nanofibers from fish collagen in wound healing. Image from Zhou et al., 2015.
Bone is a sophisticated substance, much more than just a rock-like mineral in an interesting shape. It's a living tissue, invested with cells dedicated to continually remodeling the mineral matrix.