Black tea is made from the leaves of a bush called Camellia sinensis. A process called oxidation turns the leaves from green to a dark brownish-black color. Oxidation means the leaves are exposed to moist, oxygen-rich air.
Marble is a non-foliated metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite. Geologists use the term marble to refer to metamorphosed limestone; however, stonemasons use the term more broadly to encompass unmetamorphosed limestone.Marble is commonly used for sculpture and as a building material.eologists use the term marble to refer to metamorphosed limestone; however, stonemasons use the term more broadly to encompass unmetamorphosed limestone.
Marble. Marble is a metamorphic rock resulting from regional metamorphism of sedimentary carbonate rocks. It comes in a vast range of colours from white, green, red to black and its veining generally contrasts with the base stone colour.It has been used as a building material for centuries and is suitable for many different applications including outdoor and kitchen worktops depending on the particular type of marble.t comes in a vast range of colours from white, green, red to black and its veining generally contrasts with the base stone colour. It has been used as a building material for centuries and is suitable for many different applications including outdoor and kitchen worktops depending on the particular type of marble.