All Kitchen and Bath by Design Stone
Stone Types

This does not refer to the Sedimentary, Metamorphic or Igneous types discussed earlier, but to the chemical composition of the stone.

Because each type of stone has a different chemical composition, it will react differently to common household materials.

Siliceous Stone:  Composed mainly of silica or quartz-like particles.  It tends to be very durable and relatively easy to clean with mild acidic cleaning solutions.  types of slilceous stone include granite, slate, sandstone, quartzite, brownstone and bluestone.

Calcarous Stone:  Composed mainly of calcium carbonate.  It is sensitive to acidic cleaning proudcts and frequently requires different cleaning procedures than siliceous stone.  Types of calcareous stone include marble, travertine, limestone and onyx.

How to tell the difference:  A simple acid sensitivity test can be performed to determine whether a stone is calcareous or sliceous.  You need about 4 oz. of a 10% solution of muriatic acid and an eyedropper.  Or you can uses household vinegar and an eye dropper.  Because this test may permanently etch the stone, select an out fo the way area (corner or closet) and several inches away from the mortar joint.  Apply a few drops of the acid solution to the stone surface on an area about the size of a quarter.  If the stone is calcareous, the acid drops will begin to bubble or fizz vigorously.  If little or no reaction occurs, the stone can be considered siliceous.  Rinse the area thoroughly with clean water and wipe dry.  This test may not be effective if surface sealers or liquid polishes have been applied.  If so, chip a small piece of stone off the surface and apply the acid to the exposed surface.  CAUTION:  Muriatic Acid is corrosive and is considered to be a hazardous substance.  Proper head and body protection is necessary when acid is used.