Metamorphic stone originates from a natural change from one type of stone to another type through the mixture of heat, pressure, and minerals. The change may be a development of a crystalline formation, a texture change, or a color change.
Mainly consists of calcite. It does not show much graining or crystalline structure. It has a smooth granular surface. Varies in hardness. Some dense limestones can be polished. Common colors are black, gray, white, yellow or brown. It is more likely to slain than marble. Limestone is known to contain lime from sea water.
Is a very durable formation of quartz grains (sand). Usually formed in light brown or red colors. Categorized by the most popular sandstone bonding agents such as silica, calcium, clay, and iron oxide. Soapstone: A very soft stone made of a variety of talc. It is a dense mineral that wears well and is often resistant to stains.
Sedimentary stone came from organic elements such as glaciers, rivers, wind, oceans, and plants. Tiny sedimentary pieces broke off from these elements and accumulated to form rock beds. They were bonded through millions of years of heat and pressure.
A recrystallized limestone that formed when the limestone softened from heat and pressure and recrystallized into marble where mineral changes occurred. The main consistency is calcium and dolomite. Ranges in many colors and is usually heavily veined and shows lots of grains. Hardness rates from 2.5 to 5 on the MOH Scale.
Marble is classified into three categories: (Stone World)
- Dolomite: If it has more than 40% magnesium carbonate.
- Magnesian: If it has between 5% and 40% magnesium carbonate.
- Calcite: If it has less than 5% magnesium carbonate.
Igneous stones are mainly formed through volcanic material such as magma. Underneath the Earths surface, liquid magma cooled and solidified. Mineral gases and liquids penetrated into the stone and created new crystalline formations with various colors.
Man-Made stones are derived of unnatural mixtures such resin or cement with the additive of stone chips.
Marble and granite chips embedded in a cement composition. Agglomerate or Conglomerate: Marble chips embedded in a colored resin composition.
A mix of resins that are painted or mixed with a paint to look like marble.