A mineral identical in composition with calcite or carbonate of lime, but differing from it in its crystalline form and some of its physical characters.
A crystalline form of calcite.
(a-rag'-o-nite) An orthorhombic mineral with the same composition as calcite (CaCO3), but stable at higher pressures. It occurs in hot-spring deposits, in coral reefs, in the nacre of pearls, and in the shells of some molluscs and brachiopods formed at or near atmospheric pressure.
An orthorhombic crystal form of calcium carbonate, typically occurring as many small acicular needles (see anthodite). Calcite (qv) is the more common crystal form of calcium carbonate.
This composes the calcium carbonate skeletons of reef coral and some shells.
A mineral with the same chemical composition as calcite (i.e., calcium carbonate) but with a different crystalline structure. Aragonite is metastable with respect to calcite. In other words, aragonite tends to convert to calcite over time. This conversion tends to destroy fossils that formed originally from aragonite.
Calcium Carbonate. The substance that makes up the calcium carbonate skeletons of reef coral and some shells.
A form of calcium carbonate which constitutes the shells of corals and other marine creatures. Crushed Aragonite sand is sometimes used as a Substrate when it is desired to raise the pH/Hardness of the tank water above its natural level, e.g. for African Lake Cichlids.
Rare crystalline form of calcium carbonate
A crystalline form of calcium carbonate.
a mineral form of crystalline calcium carbonate; dimorphic with calcite
A polymorph of calcite, with no cleavage and higher specific gravity. It is less stable than calcite, so fossils that were originally of aragonite may have converted to calcite, or undergone replacement by some other mineral. (Present-day mollusc shells are composed of aragonite crystals)
a translucent white mineral found in calcium carbonate.
A form of calcium carbonate, which constitutes a large portion of the pearl.
a mineral consisting of CaCO3. Aragonite is less stable than calcite under pressures at the surface of the Earth. Calcite precipitation is often inhibited, however, and both modern and ancient seawater are supersaturated with respect to calcite. With high enough supersaturations, aragonite can also precipitate. Aragonite is common in many modern carbonate sediments.
A orthorhombic form of calcium carbonate (CaCO3), less stable than the rhombohedral form ( calcite).
The substance that makes up coral skeletons and coral sand, as well as some shells. It's a form of CaCO3.
Aragonite - The orthorhombic form of calcium carbonate that crystallizes at near-surface temperatures from about 80 to 100 degrees Fahrenheit (25-35 degrees Celsius).
Calcium Carbonate in eight faced crystalline form
Aragonite is a mineral that is rarely used for jewelry. It is transparent to translucent and can range in color from honey-colored to pale reds, blues and greens to clear or white. It forms hexagonal crystals, pyramidal crystals, chisel shaped crystals, and other shapes. Aragonite has a hardness of 3.5-4 (relatively soft) and a specific gravity of 2.9 g/cm3.(average). Its chemical composition is CaCO3 (it is a form of Calcium Carbonate). Aragonite is named for Aragon, Spain, where it was first found in 1790. Aragonite is also found in many other European, North African, and some North American locations.
calcium-containing mineral usually found in the form of rock, gravel, or sand.
A form of calcium carbonate that appears in pearls.
polymorph of calcite. Produced by many organisms as a shell, test or other hard part. Unstable at the Earth's surface and is very rare in ancient sediments.
Aragonite is a form of calcium carbonate, (like coral or marble), named for Aragon, Spain, where it was first found in 1790. It is transparent to translucent and can range in color from honey-colored to pale reds, blues and greens to clear or white. It forms hexagonal crystals, pyramidal crystals, chisel shaped crystals, and other shapes. It is not often used for jewelry.
Aragonite is a carbonate mineral. It and the mineral calcite are the two common, naturally occurring polymorphs of calcium carbonate, CaCO3. The crystal lattice of aragonite differs from that of calcite, resulting in a different crystal shape, an orthorhombic system with acicular crystals.