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 is a metamorphic rock that comes from metamorphosed limestone or dolomite. Limestone is mostly calcite or calcium carbonate, CaCO 3. Dolomite CaMg(CO 3) 2 is related to limestone but is rich in magnesium.Marble has a uniform texture (non-foliated).t can be most any color including white, black, reds, greens, and more. It is usually course grained though fine-grained marble is found in some places and is highly prized for creating sculptures. Marble is used as building materials for its strength and beauty.