Onyx
Onyx marble is a translucent, layered calcite stone in pastel shades. It is typically formed in caves as stalactites and stalagmites by the slow precipitation of cold, mineral-rich water.

Most common uses: Interior wall covering. Can be used exterior in warm environments, table tops, very light duty residential flooring.

Slate
Slate is a fine-grained, metamorphic stone derived from sedimentary rock shale. It is uniform in color, available in shades such as dark to light green, mottled purple, black, gray or dark red. Veined patterns from overseas have also recently been introduced. Unless its surface has been honed smooth, slate can be recognized by its distinct cleft pattern.

Most common uses: Slate is a popular flooring material. Slate is often used for exterior paving stones, or pavers. Additional slate applications include kitchen countertops, fireplace facings, tabletops, and roofing.