Emeralds are gem-quality specimens of the beryl mineral family with a rich, distinctly green color. They are found in igneous, metamorphic, and sedimentary rocks in a small number of locations worldwide. For over 5000 years, emeralds have been one of the most desirable and valuable colored gemstones.
For example, the Agway Elevator was built on a concrete mat 3 feet thick which in turn rests on a natural foundation of stiff clay. But whatever the foundation for the elevator was, be it wood pilings or concrete slabs, construction of the elevator itself could begin once the base was completed.
Base / Casing. Base moldings are used where the floor and walls meet. They form a visual foundation and are important in establishing the character of a room. Functionally, they protect the walls from kicks, bumps, furniture, etc. Casing is used to trim interior and exterior door and window openings.