ϛʹ-6. Since marble is equigranular (having equal grain sizes), the metamorphozing process creates a denser rock that voids empty spaces and results in a strong building rock. Marble, although fairly resistant, is also soft enough to be carved and does not easily shatter. This is why columns as shown above have the ability to be carved in intricate detail near the captial, or top of the column.
NAU in Greece: The Cataclysmic Eruption of Santorini Volcano