FAQ

Stonemark Granite Training Manual p. 41
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All natural stone falls into three major classes - igneous, sedimentary and metamorphic. Stonemark
material can be classified into three groups that fall into one of three categories: granite in the igneous
class, travertine in the sedimentary class and marble in the metamorphic class.
Igneous rock is formed by the solidification or cooling of magma. The granite group is visibly granular
and consists of mostly quartz and feldspars. Granite is synonymous with quality, strength, permanence,
solidity and hardness. 90% of all countertop sales fall into the igneous class.
Sedimentary rock is the naturally cemented accumulation of particles from the physical or chemical
weathering of any existing rock. Travertine is formed as a result of accumulation of calcite from hot springs.
The holes are formed from water flowing through the stone. These holes are often filled with synthetic
resins or cements during the fabrication. 1% of all countertop sales fall into the sedimentary class.
Metamorphic rock is created when igneous or sedimentary rocks are changed by heat, pressure, chemical
reactions and time. Marble is recrystallized limestone. Marble’s structure is more compact than travertine's.
All calcareous rocks produced by nature and capable of being polished are called marbles. Impurities such
as silica, iron oxides, and graphite give marble its color & characteristic, rich veining, and clouding. These
impurities also weaken the marble. 7% of all countertop sales fall into the metamorphic class.
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