Minerals are classified on the basis of their chemical composition, which is expressed in their physical properties. This module, the second in a series on minerals, describes the physical properties that are commonly used to identify minerals. These include color, crystal form, hardness, density, luster, and cleavage.
Brown v. The Board of Education was a landmark case where the court ruled, that the segregation of public schools was unconstitutional because it violated the 14th Amendment.
