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There are many minerals that the bones contain, but the main ones that are stored in the bones (during bone production) are calcium and phosphates. Magnesium is another mineral in bone composition. When bones are breaking down minerals to be released into the blood stream, it is mainly calcium and phosphorus.

From wikipedia "osseous tissue" Bone tissue is a mineralized connective tissue. It is formed by cells, called osteoblasts, that deposit a matrix of Type-I collagen and also release calcium, magnesium, and phosphate ions that ultimately combine chemically within the collagenous matrix into the crystalline mineral hydroxyapatite. The combination of hard mineral and flexible collagen makes bone harder and stronger than cartilage without being brittle.

The primary anatomical and functional unit. The compact bone consists of a repeating structure called Haversian system, or OSTEON. Each osteon has concentric layers of mineralized matrix, called concentric lamellae, which are deposited around a central canal, also known as the Haversian canal, containing blood vessels and nerves that service the bone.

From wikipedia "osteoblast" Osteoblasts produce osteoid, which is composed mainly of Type I collagen. Osteoblasts are also responsible for mineralization of the osteoid matrix. Zinc, copper and sodium are some of the many minerals produced.

Bone is a dynamic tissue that is constantly being reshaped by osteoblasts, which build bone, and osteoclasts, which resorb bone. Osteoblast cells tend to decrease as individuals become elderly, thus decreasing the natural renovation of the bone tissue.

Calcium and phosphate are the main ones. Its actually stored in the bone together in a form called hydroxyapatite.

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