A break in the acetabulumâthe socket located on each side of the pelvisâis less common than other types of pelvic or hip fractures. It usually occurs as the result of a car accident or fall from a significant height, with damage to other bones and soft structures in and around the hip and pelvis.
The first and most basic characteristic of all minerals is that they occur naturally. Minerals are not made or influenced by human activity. However, some minerals, such as diamonds, can be manufactured by humans.
Minerals are: 1) naturally occuring 2) inorganic 3) solids with 4) definite chemical compositions and 5) an orderly arrangement of atoms. There are over 2000 different minerals. A few common  rock-forming minerals  make up most of the rocks in earth's crust, and most of these (over 90 percent) are silicates.The minerals are grouped based on their chemical composition. few common  rock-forming minerals  make up most of the rocks in earth's crust, and most of these (over 90 percent) are silicates. The minerals are grouped based on their chemical composition.