Limestone deposits (calcite) that have been dissolved by groundwater. The characteristic holes in travertine are the result of the hot water and gasses escaping during the formation process. Ideal for floors, walls, and splashes. The value of this stone is determined by: 1) the size and number of fill holes (density), 2) rare qualities or limited availability, 3) color consistency from piece to piece, 4) factory honing, polishing and/or filling processes. Colors are abundant in creams, chocolate brown, golden and red tones. There is an abundance of finishes (honed, brushed, tumbled, polished), edge treatments (squared, tumbled, chiseled, antiqued) and sizes (versailles pattern, rectangles, very large and very small formats). Travertine is not acid resistant.
The same geological makeup as travertine, however, onyx is formed in cool, cavernous conditions, similar to stalactites. Onyx is dense and will take a high polish. This multi-colored, translucent stone is most commonly available with a glossy finish. It is suitable for walls and extremely light duty (bathroom) floors and splashes. Onyx is not acid resistant.
A travertine or limestone that has had heat, pressure and fluid activity applied that results in a change in structure. This metamorphic transformation results in a denser stone with a myriad of colors that can be finished with a high gloss, honed or brushed. A polished finish is ideal for vertical installations or for horizontal installations where abrasion, stain and acid resistance are not a concern. Marble is not acid resistant.
Stone that was formed by the cooling and crystallization of magma (molten rock). This extremely dense stone has hundreds of color in primarily earthy tones. Granite can be finished a number of ways including polished, honed, leathered, and flamed. Granite is acid, stain, and wear resistant. Many granites are also ideal for high traffic (commercial) floors and countertop installations.
Slate, Sandstone & Quartzite
Shale, under heat and pressure, can form into slate. Beach sand can be consolidated to form into sandstone. Sandstone, under heat and pressure, can form into quartzite. Granite is acid resistant. Many of these stones can be used indoors or outdoors in a variety of horizontal and vertical applications.