chemical formula of oragonite is
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Answer:
CaCo3 is the chemical formula of argonite
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Answer:
Explanation:
Calcium carbonate forms as both Aragonite and Calcite, and these two minerals only differ in their crystallization. Calcite, the more common mineral, forms in trigonal crystals, whereas Aragonite forms orthorhombic crystals. On occasion, crystals of Aragonite and Calcite are too small to be individually determined, and it is only possible to distinguish these two minerals with optical or x-ray testing. The true identity of microcrystalline forms of Aragonite or Calcite may also not be known without complex testing, and this can also cause a confusion between these species.
Most large Aragonite crystals are twinned growths of three individual crystals that form pseudohexagonal trillings. Although Aragonite crystallizes in the orthorhombic system, most prismatic crystals are hexagonally shaped due to the twinning. Trillings can be identified by their multi-directional basal striations from each individual member crystal.
Other minerals may form pseudomorphs after Aragonite. A peculiarity of the mineral world is Calcite after Aragonite, which is a pseudomorph after an existing paramorph. Some Aragonite crystals available to collectors are actually Calcite pseudomorphs after Aragonite. A rare but popular pseudomorph is Copper after Aragonite. Aragonite may also contain sand inclusions, which give a specimen a brown color.
A particularly interesting formation of Aragonite is as a deposition product of hot, mineral-rich springs. The water releases calcium upon emerging from the spring, and forms growing mounds and thick crusts around the springs. When these are banded, they may be carved and given trade names such as "Onyx Marble", and "California Onyx".
Aragonite is the main component of many organic substances, such as pearl and coral. The iridescent surface of Pearl and mother-of-pearl is actually a layer of Aragonite secreted by mollusks and related invertebrates. Some forms of Aragonite, especially the Flos Ferri variety, are brittle and very fragile, and may easily break when touched. Such specimens need to be much care.
Aragonite was named by Abrahan Gottlieb Werner after Molina de Aragón, Spain, the type locality where this mineral was first described.
Chemical Formula CaCO3
Composition Calcium carbonate, sometimes with some strontium, lead, and zinc.
Variable Formula (Ca,Sr,Pb,Zn)CO3
Color Colorless, white, brown, gray, yellow, red, pink, purple, orange, blue, green
Streak White
Hardness 3.5 - 4