of
Ganite
of
Marble
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| Granite, coarse to medium-grained, is believed to be an acid plutonic igneous rock with a fairly limited range of composition. It is mostly comprised of quartz, feldspar and potassium, containing very little calcite.cd by the cooling of silicate melt {magma} at depth, granite is the hardest of the four. It requires minimal maintenance and its color will not fade or change with age. It is the only material that can offer this feature in terms of quality. There are only eight natural hues but the range of tones is broad within each basic color category. The basic hues are white, gray, buff, pink, red, blue, green and black. Minerals such as mica and quartz, often pale or even colorless, can modify the tonal depth within a single hue. Although it is the hardest stone, granite is porous and will still stain. | ||||||||||||||||||||
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| Examples
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| Marble, a metamorphic stone is created by the natural changes from one stone to another. Extreme high temperature, pressure, aqueous liquids and the addition of minerals recrystalizes limestone and changes its texture and color forming a new stone. Mostly composed of calcium, marble is softer and more porous than granite and has far more variations in color and grain. It may require a bit more maintenance and has the tendency to stain more easily than granite. Due to its wide range of grain and vivid colors, marble is used more often in decorative applications throughout the world. The snow-white Carrara marble used by Michelangelo is still quarried in Italy today. As white as it is it still contains quartz, mica, and tiny traces of graphite flakes. Other marbles contain silicate minerals that give it its color. The green comes from green pyroxenes and amphiboles, brown comes from garnet and vesuvianite, yellow from epidote, chondrodite and sphene, and black marble gets its color from scales of graphite. | ||||||||||||||||||||
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| Examples
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| Introduction | ||||||||||||||||||||