Marble is a metamorphic rock resulting from the metamorphism of limestone, composed mostly of calcite. It is mainly used for sculpture, as a building material, and in many other applications.

Marble is a metamorphic rock produced from regional or rarely contact metamorphism of sedimentary carbonate rocks, either limestone or dolomite rock, or metamorphism of older marble. This metamorphic process causes a complete recrystallization of the original rock into an interlocking mosaic of calcite, aragonite and/or dolomite crystals. The temperatures and pressures necessary to form marble usually destroy any fossils and sedimentary textures present in the original rock.

Pure white marble is the result of metamorphism of very pure limestones. The characteristic swirls and veins of many colored marble diversities are usually on account of various mineral impurities such as clay, chert, silt, sand and iron oxides, or which were originally present as grains or layers in the limestone. Green coloration is often due to serpentine resulting from originally high magnesium limestone or dolostone with silica impurities. These various impurities have been mobilized and recrystallized by the intense pressure and heat of the metamorphism.

As the favorite medium for Greek and Roman sculptors and architects, marble has become a cultural symbol of tradition and refined taste. Its extremely varied and colorful patterns make it a favorite decorative material.

In the construction, specifically the dimension stone trade, the term "marble" is used for any crystalline calcitic and some non-calcitic rocks useful as building stone.

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 is known as marble except the granite such as travertine, onyx, serpentine and limestone.

Marble is motly used for interior and exterior wall cladding, interior and exterior paving, fireplace facing and hearth, lavatory tops, residential and commercial counter tops, table tops, statuary, novelty items, many non architectural uses such as tooth paste, paint whiting, agricultural lime, etc.

Granite is an intrusive igneous rock. Intrusions (plutons) are bodies of igneous rock that result from crystallization of magma deep underground. Slow cooling at depth in the Earth produces larger crystals (coarse grained) that can easily be seen by the unaided eye.

Granite is generally light colored in shades of white, grey, or pink. Minerals are mostly quartz and feldspar, with small amounts of mica (muscovite or biotite). Minerals within granite typically appear as small dots throughout the stone, once creating a "salt and pepper" look. Other types have veining similar to marble. Granite is a dense-textured, hard stone. It can be highly polished or finished in a variety of other ways. Granite is mostly used for interior and exterior wall cladding, Interior and exterior paving, residential and commercial countertops, monuments, curbing, statuary, tables.

Travertine marble is a variety of limestone formed in pools by the slow precipitation of hot, mineral-rich spring water. The "holes" characteristic of travertine were created when carbon dioxide bubbles were trapped as the stone was being formed. Although the classic travertine's are recognizable by their homogenous ecru to dark colors, dark reds are available to dark brown veining. Mostly used for interior and exterior wall cladding, interior and exterior paving, statuary and curbing.

Limestone is widely used as a building stone because it is readily available and easy to work with. It is a sedimentary stone, layered and formed from the skeletons and shells of sea creatures that lived in vast, warm seas millions of years ago. Much domestic limestone is gray to buff in color, while some pastel shades of yellow to pink are available.

When the mineral dolomite is present, it makes the limestone harder and capable of being polished in the same manner as metamorphic marble. Limestone is mostly used for interior and exterior wall cladding, interior and exterior paving and rarely as counter tops.

PYROSTONES Mining Ind. & Tra. Co. Ltd.

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