Marble is simply limestone that has been metamorphosed by the heat and pressure of volcanic activity deep in the earth over millions of years. The color variations seen in marble are due to impurities present when the rock is formed. The great variety of colors and veining patterns created by these impurities present allow for an array of design options.
Tumbled Marble is produced by placing the marble into large slowly vibrating cylindrical containers, and with the addition of an abrasive material and water, the antique effect is created. Marble that is tumbled has softer looking edges, sometimes almost rounded; producing a rustic, aged effect. Tumbled marble is low maintenance and doesn't show wear like glossy tile can.
Tumbled Marble will etch from acidic liquids, which can be prevented with a manufacturer-approved sealer. To retain the appearance grout should be kept out of the texture during the grouting process, there are several products on the market today that will prevent the texture from filling during the grouting process.