Natural occurrence

Calcite is often the primary constituent of the shells of marine organisms, e.g., plankton (such as coccoliths and planktic foraminifera), the hard parts of red algae, some sponges, brachiopoda, echinoderms, most bryozoa, and parts of the shells of some bivalves, such as oysters and rudists).

Calcite is a common constituent of sedimentary rocks, limestone in particular, much of which is formed from the shells of dead marine organisms. Approximately 10% of sedimentary rock is limestone.




Calcite is the primary mineral in metamorphic marble. It also occurs as a vein mineral in deposits from hot springs, and it occurs in caverns as stalactites and stalagmites.

Calcite may also be found in volcanic or mantle-derived rocks such as carbonatites, kimberlites, or rarely in peridotites.

Calcite is found in spectacular form in the Snowy River Cave of New Mexico as mentioned above, where microorganisms are credited with natural formations.

Trilobites, which are now extinct, had unique compound eyes. They used clear calcite crystals to form the lenses of their eyes.

Lublinite is a fibrous, efflorescent form of calcite.

Calcium carbonate is a chemical compound with the chemical formula CaCO3. It is a common substance found as rock in all parts of the world, and is the

Calcium carbonate is a chemical compound with the chemical formula CaCO3. It is a common substance found as rock in all parts of the world, and is the main component of shells of marine organisms, snails, and eggshells. Calcium carbonate is the active ingredient in agricultural lime, and is usually the principal cause of hard water. It is commonly used medicinally as a calcium supplement or as an antacid, but high consumption can be hazardous

Stone Hart Art

In 1631, Shah Jahan, emperor during the Mughal empire's period of greatest prosperity, was griefstricken when his third wife, Mumtaz Mahal, died during the birth of their fourteenth child, Gauhara Begum. The court chronicles of Shah Jahan's grief illustrates the love story traditionally held as an inspiration for Taj Mahal. The construction of Taj Mahal begun soon after Mumtaz's death with the principal mausoleum completed in 1648. The surrounding buildings and garden were finished five years later. Emperor Shah Jahan himself described the Taj in these words:

Should guilty seek asylum here,
Like one pardoned, he becomes free from sin.
Should a sinner make his way to this mansion,
All his past sins are to be washed away.
The sight of this mansion creates sorrowing sighs;
And the sun and the moon shed tears from their eyes.
In this world this edifice has been made;
To display thereby the creator's glory.



Tomb of Humayun shares architectural similarities with the Taj MahalThe Taj Mahal incorporates and expands on design traditions of Persian and earlier Mughal architecture. Specific inspiration came from successful Timurid and Mughal buildings including the Gur-e Amir (the tomb of Timur, progenitor of the Mughal dynasty, in Samarkand),[8] Humayun's Tomb, Itmad-Ud-Daulah's Tomb (sometimes called the Baby Taj), and Shah Jahan's own Jama Masjid in Delhi. While earlier Mughal buildings were primarily constructed of red sandstone, Shah Jahan promoted the use of white marble inlaid with semi-precious stones, and buildings under his patronage reached new levels of refinement

Mile Stone

The Holston Formation, alternately known as the Holston Limestone, is a stratigraphic unit of Ordovician age within the Chickamauga Group in the Ridge-and-Valley physiographic province of the southeastern United States. A 120-mile (190 km) long outcrop belt of the Holston in East Tennessee is the source of the decorative building stone known as Tennessee marble.

Near Knoxville the Holston Formation is about 400 feet (120 m) thick but it thins toward the southwest; near Cleveland, Tennessee it is only 200 feet thick. The rock that is quarried for marble is a highly pure (97% CaCO3) crystalline limestone, pink to cedar-red in color.

Among the notable buildings where Tennessee marble is used as a building stone are two in Washington, D.C.: the National Gallery of Art, which uses stone from Knox and Blount counties, and the United States Capitol, which has stairways constructed from Hawkins County marble.

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