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J. Kindt, G. Fantner, P. J. Thurner, G. Schitter, P.K. Hansma:
"A New Technique for Imaging Mineralized Fibrils on Bovine Trabecular Bone Fracture Surfaces by Atomic Force Microscopy";
Talk: Material Research Society Symposium 2005, Warrendale (USA); 2005; in: "Proceedings of the Material Research Society Symposium 2005", (2005), 7 pages.

High resolution atomic force microscopy (AFM) images of bovine trabecular bone
fracture surfaces reveal individual fibrils coated with extrafibrillar mineral particles. The
mineral particles are distinctly different in different regions. In some regions the particles
have average dimensions of (70 ± 35) nm along the fibrils and about half that across the
fibrils. In other regions they are smaller and rounder, of order (53 ± 14) nm both along
and across the fibrils. In other regions they are smaller and rounder, of order (25 ± 15)
nm both along and across the fibrils, with more rounded top surfaces.
Significantly, we rarely observed bare collagen fibrils. If the observed particles can be
verified to be native extrafibrillar mineral, this could imply that the fractures which
created the observed areas propagated within the mineralized extrafibrillar matrix.