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).here is a lot of variation in the color and texture of marble. The two main influences are the kind of limestone that makes up the parent rock and the kind and degree of metamorphism.