A mineral is a naturally occurring crystalline material that has a specific or limited range of chemical compositions. Clay minerals have a sheet-like structure and are composed of mainly tetrahedrally arranged silicate and octahedrally arranged aluminate groups.Kaolinite is the principal mineral in kaolin clays.It is a 1:1 clay mineral â the basic unit is composed of a 2-dimensional (2D) layer of silicate groups tightly bonded to a 2D layer of aluminate groups. mineral is a naturally occurring crystalline material that has a specific or limited range of chemical compositions. Clay minerals have a sheet-like structure and are composed of mainly tetrahedrally arranged silicate and octahedrally arranged aluminate groups.
The Civil Service Retirement Act, which became effective on August 1, 1920, established a retirement system for certain Federal employees. The Civil Service Retirement System (CSRS) is a defined benefit, contributory retirement system. Employees and agencies share in the expense of the annuities to which employees become entitled. Eligibility is based on your age and the number of years of creditable service and any other special requirements. In addition, you must have served in a position subject to CSRS coverage for one of the last two years before your retirement.
The Federal Employees Retirement System (FERS) is the retirement system for employees within the United States civil service. FERS became effective January 1, 1987 to replace the Civil Service Retirement System (CSRS) and to conform federal retirement plans in line with those in the private sector. FERS consists of three major components: