True marbles in the geological sense are metamorphosed limestone and are principally composed of recrystallised calcite formed into an interlocking granular structure. Some hard or partially metamorphosed limestones are incorrectly referred to as marble, even though they exhibit many of the characteristics of marble.

In its ‘purest’ state marble is typically white, however the presence of other minerals can often provide colour(s). In some cases the colour appears as irregular shaped patches (brecciation) or as substantial veining. Specialist advice should be obtained as to the suitability of such marbles in particular locations.

Greater care must also be taken during installation as other construction defects easily taint the pureness of marble, particularly from underlying materials, and may result in staining at a later date. 

It is common to use marble with a highly polished surface finish and, as a consequence, slip resistance should be carefully considered. Marble is imported.