Marble Calcite Limestone

Limestones may include layers of clay or sand which may form the attractive flow banding and colours found in decorative marble. With continued metamorphism these crystal seeds grow while any clay deposits in the limestone transform into silicate structures such as mica. When the heat and pressure hits the limestone calcite seed crystals form.

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The variety of colours exhibited by marble are a consequence of minor amounts of impurities being incorporated with the calcite.

Marble calcite limestone.

Marble forms under such conditions because the calcite forming the limestone recrystallises forming a denser rock consisting of roughly equigranular calcite crystals. If the limestone is pure a white marble is formed. Marble is a metamorphic rock formed by the alteration of limestone by heat and pressure. The calcite in the limestone changes and fossils and layering in the original limestone disappear as interlocking grains grow.

Because marble is a fairly soft material only a three on the mohs hardness scale it is easy to cut and carve. Form of it when limestone buried deep in the older layers of earth s crust is subjected to heat and pressure from thick layers of overlying sediments. It is composed primarily of the mineral calcite caco 3 and usually contains other minerals such as clay minerals micas quartz pyrite iron oxides and graphite under the conditions of metamorphism the calcite in the limestone recrystallizes to form a rock that is. Marble is a granular metamorphic rock it is derived from limestone or dolomite and it consists of a mass of interlocking grains of calcite or the mineral dolomite.

Marble is a metamorphic rock formed when limestone is exposed to high temperatures and pressures. The calcite in the limestone changes and fossils and layering in the original limestone disappear as interlocking grains grow. Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. If the limestone is pure a white marble is formed.

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