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Tile Selection Guide

MARBLE

GRANITE

There are more than eight thousand types of marble in  the world today, and the number continues to grow.  It would be  impossible to list every type available, but there are some common  characteristics that easily identify marble.

For those of you with a scientific curiosity, marble is defined as any limestone that will take a polish.  Limestone, and,  therefore, marbles are composed of minerals of calcite or dolomite.   Marble in its purest state is white.  Colored marbles are the result of other minerals mixed with the calcite or dolomite.

Now, for those of you who don't really care about that  of which marble is made, there are some common recognizable  characteristics. Marble, no matter what color, will usually have some  type of veining running through it.  The veins are usually different in color than the main color of the stone.  There are, however,  exceptions to the rule. Some marbles, such as Thassos White, will have  little to no veining. Marble is relatively soft, when compared to other  stones such as granite.  It will scratch very easily.  If you run a  knife blade lightly across the surface of the stone, and it leaves a  scratch, you may have marble.  On dark marbles, these scratches will  appear as light lines on the surface of the stone.  On lighter colored  marble, detecting a scratch may be more difficult.  Marble is also very sensitive to acidic chemicals.  Vinegar is acidic, and will leave a  dull spot on marble. Avoid the following acidic materials: vinegar,  lemon, tomato and tomato sauce, bleach, coffee, fruit juices, wine,  urine, vomit, tile cleaners (like Tile X), mildew removers, X-14, acidic toilet bowl cleaners, cleaners with lemon, pool Ph. decreaser (Muziatic acid), and driveway cleaners.  Most products that contain acids will  have their ingredients listed on the bottle label.  Avoid using them  on, or near, any marble surface.

Like marble, granite is also a natural stone with many  colors available; however, the similarities stop here. Unlike marble,  granite is composed of different minerals with different properties.  Granite is chiefly composed of 30% Quartz and 60% Feldspar. These  minerals are much harder than the calcite of marbles, and, for this  reason, granite will not scratch as easily as marble.  Granite is very  resistant to most acids, and will not etch, nor leave a dull spot, like  it does on marble.  The only acid to avoid is Hydrofluoric acid, which  is found in most rust removers.  Granite rarely has the veining  characteristic of marble.  Granite contains crystals, which are very  distinct appearing to be small to medium stones compacted together.   There are some exceptions.  Blue Azul will have a vein like pattern,  but if looked at closely this vein will also have small, distinct  crystals. Granite is an excellent choice for countertops, especially in  the kitchen, where it will be exposed to acidic foods and chemicals.

LIMESTONE

I'll try to make this as clear as possible.  Limestone is not marble, but marble is limestone. Let me clarify.  Limestone is  made of calcite from shells, coral, and other debris.  It is  sedimentary rock formed by the breakdown of other rocks or shells, etc.  Marble is a limestone that has been subjected to great heat and  pressure that changes (metamorphosis) to marble.  So you ask, "What's  the difference?" There is a considerable difference.  Limestone is  usually loosely held together, and may differ in porosity from marble.  The course grains in limestone give them excellent wear ability.   Limestone can have numerous fossil impressions that are well preserved.  If a slab of stone has various shell or animal-like patterns, there is a good likelihood it is limestone.  To identify limestone, look for  fossil-like impressions, and loose grain structure.  Limestone comes in various colors, but most are shades of brown, or tan, and some lean  toward red.  All seem to fall into the earth-tone color range.  Limestone is becoming increasingly popular in the West and Southwest.

SLATE

Slate is a stone.  It is commonly gray in color, but  you may find green, yellow, and red hues.  It is a material from  metamorphosed shale; that is, it consists of clay-like materials, which  have undergone change with exposure to heat and pressure.  For the  layman, slate can be recognized by its sheet-like structure.  The  material is usually thin, and, if broken in half, will flake off into  sheets.  Slate is rarely highly reflective,  unless a coating is  placed on top of it.  Its surface is usually uneven, unless machine  sanded.

QUARTZITE

Quartzite is a rare material used for flooring.  Like  limestone, it is gaining in popularity.  It can be found in colors from white to a pinkish-brown.  It is composed of metamorphosed quartz  sand, or sandstone.  It is acid resistant.  Its texture appears  sugary.  It is commonly used on floors, patios,  and driveways, etc.

SANDSTONE

Sandstone is a very rare flooring material.  It  commonly is used for building stone, but occasionally makes its way  indoor as a flooring surface.  Composed primarily of quartz, it is  loose and rough in texture.  As its name implies, it appears as sand  cemented together.  It is also acid resistant, and rarely is polished.

AGGLOMERATES

Agglomerate stones are composed of broken pieces of  marble, and sometimes granite, cemented together, with a polyester or  epoxy bonding material.  Their properties are similar to the marble, or granite, from which they are made.  Their plastic binders may appear  less shiny, giving the stone an alligator skin-like appearance.  Agglomerates are very popular, and inexpensive, compared to other  natural stone.  The refinishing requirements are slightly different due to the plastic binders.

TERRAZZO TILE

Terrazzo flooring was very popular in the late 1950's,  and 1960's.  It is making a big comeback in the '90's. Terrazzo is a  poured floor similar to cement, with the addition of sized marble chips. The marble chip and cement mixture is poured and spread out.  The  final product is achieved after grinding it flat, and applying a wax  coating. The maintenance requirements for terrazzo are identical to that of marble.  Terrazzo is also available as a tile.

COQUINA OR SHELL STONE

Coquina or SHELL STONE is a limestone consisting of  broken fragments of shells and corals.  Sometimes it may be called  coral stone. It is a sedimentary rock, and is extremely porous. It wears relatively well, and is rarely polished.

ONYX

Onyx is a type of marble, which has been deposited from cold solutions.  It is characteristically translucent, with many veins running concentric to one another.  It is very expensive, and usually  found as a small tabletop.  Its properties are similar to marble.

TRAVERTINE

Travertine is a type of limestone, but differs, in that it is formed in hot springs called karst.  The water movement in this  karst erodes the travertine creating holes in the stone.  Polished  travertine will usually have these holes filled with colored Portland  cement.  These fillers typically are not polished, and will give the  travertine a blotchy appearance. Unfilled travertine will exhibit these  holes, and are commonly found on walls, floors, and building exteriors.  Travertine is commonly found in tans and beige colors, but can also be  found in silver and reds.

CONCRETE TILE

Concrete tile is available in various sizes, and an  endless variety of colors.  It can be painted to simulate natural  stone, and is often mistaken for the real thing.  These tiles are an  excellent substitute for natural stone for those on a tighter budget.   Care must be taken in selection, since many poor grade concrete tiles  will wear and discolor faster, and easier, than most natural stones.

MEXICAN TILE/TERRA COTTA

Mexican tile is a terra cotta type material.  Terra  cotta is made from clay, which is baked in the sun, or oven dried.   Color range is limited to browns, yellows, and reds.  Some terra cotta  can be stained, or pickled, with dyes to change its color.  These dyes  easily wear. Mexican tiles are typically unglazed, but there are glazed  tiles available.

CERAMIC TILE

Ceramic tiles are made from a mixture of clays baked at very high temperatures.  From small one-inch mosaics to large  eighteen-inch square floor tiles, the size and color of ceramics are  limitless.

Ceramic tiles are available in glazed or unglazed  finishes.  A glazed finish is a hard surface, usually glossy or  satin-like, but can be matte, semi-matte, or dull.  Glazing is achieved during the baking process by applying a special material called a  bisque, after which a second occurs.  The color and patterns in most  glazed ceramic tile is in this glazed layer. When you chip a ceramic  tile, you remove this glazed surface.

Unglazed ceramic tile contains no glaze.  It is  usually dull and is die color of the clay used to make the tile.   Unglazed ceramic tiles that have a sheen or gloss, have a sealer or wax  treatment applied to them.

QUARRY TILE

Quarry tile is an unglazed ceramic tile.  It is  commonly found in commercial kitchens and restaurants.  The surface is  rough, and available in earth-tone colors.  They are excellent tile for areas where slip resistance is a concern.

PORCELAIN TILE

Porcelain tile is becoming increasingly popular as a  durable floor tile. Like ceramic tile, porcelain is baked.  Unlike  glazed ceramic, porcelain does not have a bisque surface.  The material is consistent throughout the tile.  It is almost impossible to chip,  and is nearly indestructible.  Light-colored porcelain can trap dirt,  requiring regular maintenance.  Porcelain is available in tiles as  large as two foot square.  It comes in a honed or polished finish.

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