Minerals and gems are classified by their physical properties, including hardness, luster, color, density, and magnetism. They're also identified by the ways in which they break, or the type of ...

A common mineral, α-alumina, found abundantly in Earth's crust, may have played a critical role in initiating the chemical ...

The long-acting progestogen injectable contraceptives depot medroxyprogesterone acetate and norethisterone enanthate have been found to adversely affect bone mineral density in adult premenopausal ...

Bone density is a measure of the amount of minerals, such as calcium, in the bones. Bones with higher levels of minerals are ...

Bone mineral density is a measure of bone strength quantified by the amount of minerals in bone tissue. It peaks during young adulthood and slowly declines over the rest of the life cycle.