Marble is a metamorphic rock formed by the alteration of limestone by heat and pressure. Marble has many different sizes of crystals. Marble has many color variances due to the impurities present at formation. Marble is much harder than its parent rock. This allows it to take a polish, which makes it a good material for use as a building material, making sink tops, bathtubs, and a carving stone for artists. Ideal for foyers, bathrooms, floors, and hearths.Marble has both a scientific and commercial definition. Scientific marble was once limestone that achieved metamorphosis from intense pressures and high temperatures within the earth. This altered its crystalline structure and introduced other minerals that produced the valuable colors and veining. Commercially, any stone capable of taking a polish (with the exception of granite) is known as marble. read more.
Granite rocks are igneous rocks, which were formed by slowly cooling pockets of magma that were trapped beneath the earth's surface. Granite is used for long lasting monuments and for trim and decoration on buildings. Igneous rocks are called fire rocks and are formed either underground or aboveground. Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets. As these pockets of magma cool slowly underground, the magma becomes igneous rocks. Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's surface. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground. read more.