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.
Although similar to rocks, minerals are the building blocks for making rocks, and are found in various types of rock in differing shapes and chemical compositions throughout the Earth's crust. Although minerals differ in shape, composition and distribution, four major classes of minerals make up the Earthâs crust. Silicates The silicate class of minerals makes up 90 percent of the Earthâs crust, and is compounds of silicon and other chemical elements. The two most common silicate types found in the Earthâs crust are quartz and feldspar minerals.