Coral Stone

Calcium carbonate

Calcium carbonate is a chemical compound with the chemical formula CaCO3. It is a common substance found in rocks as the minerals calcite and aragonite, most notably in chalk and limestone, eggshells, gastropod shells, shellfish skeletons and pearls. Materials containing much calcium carbonate or resembling it are described as calcareous.

Kidney stone disease

Kidney stone disease or urinary stone disease is a crystallopathy that occurs when there is an excess of minerals in the urine and not enough liquid or hydration. This imbalance causes tiny crystals to aggregate and form hard masses, or calculi (stones), in the upper urinary tract. Because renal calculi typically form in the kidney, if small enough they may pass out of the urinary tract through the urine stream. A small calculus may pass without causing any symptoms. However, if a stone grows to more than 5 millimeters, it can cause blockage of the ureter, resulting in extremely sharp and severe pain in the lower back that often radiates to the groin. A calculus may also result in blood in the urine, vomiting, swelling of the kidney, or painful urination. About half of all people who have had a kidney stone are likely to develop another within ten years.

Coral

Corals are colonial marine invertebrates within the subphylum Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.

Rock (geology)

In geology, a rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition, and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere. The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy. It may be limited to rocks found on Earth, or it may include planetary geology that studies the rocks of other celestial objects.

coral

Noun

1. Any of many species of marine invertebrates in the class Anthozoa, most of which build hard calcium carbonate skeletons and form colonies, or a colony belonging to one of those species.
2. A hard substance made of the skeletons of these organisms.

Adjective

1. Made of coral.
2. Having the orange-pink color of coral.

stone

Noun

1. A hard earthen substance that can form rocks; especially, such substance when regarded as a building material.
2. A piece of such material: a block of stone, rock or a pebble.

Adjective

1. Constructed of stone.
2. Having the appearance of stone.