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Marble

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Physical origins
==Physical origins==
 
Marble is a rock resulting from [[metamorphism]] of [[sedimentary rock|sedimentary]] [[carbonate rock]]s, most commonly [[limestone]] or [[dolostone|dolomite rock]]. Metamorphism causes variable recrystallization of the original carbonate mineral grains. The resulting marble rock is typically composed of an interlocking mosaic of carbonate [[crystal]]s. Primary sedimentary textures and structures of the original carbonate rock ([[protolith]]) have typically been modified or destroyed.VIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCOVIVA FRANCO
 
Pure white marble is the result of metamorphism of a very pure ([[Silicate minerals|silicate]]-poor) limestone or dolomite protolith. The characteristic swirls and [[Vein (geology)|vein]]s of many colored marble varieties are usually due to various mineral impurities such as [[clay]], [[silt]], [[sand]], [[iron oxide]]s, or [[chert]] which were originally present as grains or layers in the limestone. Green coloration is often due to [[Serpentine group|serpentine]] resulting from originally magnesium-rich limestone or dolostone with [[silica]] impurities. These various impurities have been mobilized and recrystallized by the intense pressure and heat of the metamorphism.VIVA FRANCO
 
==Types==
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