A bone dating from the Pleistocene Ice Age of an extinct species of elephant
Hydroxyapatite crystals on matrix
Cross-section details of a long bone
Hydroxyapatite
Micrograph of cancellous bone
Needle-like hydroxyapatite crystals on stainless steel. Scanning electron microscope picture from University of Tartu.
Bone cells
Nanoscale coating of Ca-HAp, image taken with scanning probe microscope
Light micrograph of decalcified cancellous bone tissue displaying osteoblasts actively synthesizing osteoid, containing two osteocytes.
A 3D visualization of half of a hydroxyapatite unit cell, from x-ray crystallography
Transmission electron micrograph of decalcified woven bone matrix displaying characteristic irregular orientation of collagen fibers
Structure of a long bone
One way to classify bones is by their shape or appearance.
Endochondral ossification
Light micrograph of a section through a juvenile knee joint (rat) showing the cartilagineous growth plates
Radiography used to identify possible bone fractures after a knee injury
Reduced bone mineral density in Osteoporosis (R), increasing the likelihood of fractures
Human femurs and humerus from Roman period, with evidence of healed fractures
Skeletal fluorosis in a cow's leg, due to industrial contamination
Leg and pelvic girdle bones of bird
Bones of slaughtered cattle on a farm in Namibia
Cells in bone marrow
Scanning electron microscope of bone at 100× magnification
Structure detail of an animal bone

The matrix is hardened by the binding of inorganic mineral salt, calcium phosphate, in a chemical arrangement known as bone mineral, a form of calcium hydroxylapatite.

- Bone

Hydroxyapatite is present in bone and teeth; bone is made primarily of HA crystals interspersed in a collagen matrix—65 to 70% of the mass of bone is HA.

- Hydroxyapatite
A bone dating from the Pleistocene Ice Age of an extinct species of elephant

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Alpha

Scanning electron microscopy image of bone mineral

Bone mineral

Scanning electron microscopy image of bone mineral

Bone mineral (also called inorganic bone phase, bone salt, or bone apatite) is the inorganic component of bone tissue.

Bone mineral is formed predominantly from carbonated hydroxyapatite with lower crystallinity.