Brown Marble Rock

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Brown marble rock.

Impurities produce pale gray brown or variegated colored rock. Look for bronze colored enstatite in igneous rocks and brown diopside in metamorphosed dolomite rocks. Marble is a metamorphic stone formed by subjecting limestone to heat or pressure. The relief of its surface evokes the millenary trunks of the great american sequoias.

In pure form marble consists of calcium carbonate calcite and is sparkling white. It presents a particular striated aspect due to its marked bands in brown earth and grey tones. The particular morphology of this natural stone sculpts a beautiful pattern of sinuous forms. Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism.

Marble is commonly used for sculpture and as a building material. While the most common pyroxene mineral augite is black the diopside and enstatite series are shades of green that may veer over to brown with high iron contents. Onyx marble was the alabaster of the ancients but alabaster is now defined as gypsum a calcium sulfate rock. 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.

Black marble also occurs.