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en.wikipedia.org/wiki/Calcite

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). ... When conditions are right for precipitation, calcite forms mineral coatings that ... Calcite is a common constituent of sedimentary rocks, limestone in particular, much of which is formed from the shells of dead marine organisms.

www.minerals.net/mineral/calcite.aspx

They are similar in many physical properties, and may partially or fully replace ... Calcite forms trigonal crystals, whereas Aragonite forms orthorhombic crystals. ... These calcareous growths have designated names based on their shape, habit, ...

www.galleries.com/Calcite

There are more than 300 crystal forms identified in calcite and these forms can combine to produce the thousand different crystal variations. Calcite also ...

geology.com/minerals/calcite.shtml

Calcite: Calcite in the form of white marble was the primary stone used in the ... Limestone blocks were the primary construction material used in many of the ... crushed limestone is dispensed into the streams to neutralize their waters. Calcium ...

www.mindat.org/min-859.html

A very common and widespread mineral with highly variable forms and colours. ... NJ, area for massive calcite that fluoresces two shades and intensities of red ...

www.esci.umn.edu/courses/1001/minerals/calcite.shtml

Without calcite and aragonite many of Earth's organisms could not exist. ... and microscopic plankton use calcite and aragonite to form their shells and hard parts  ...

www.britannica.com/science/calcite

calcite: The most common form of natural calcium carbonate (CaCO 3), ... It is polymorphous (same chemical formula but different crystal structure) with the ... Mn, Fe, boron [B], bromine [Br], Sr, and/or Y), substituting for some of their calcium.

www.kidzrocks.com/v/education/CALCITE

Learn about the rocks and minerals like calcite with photos, videos, origin of the rocks ... There are lots of interesting forms and varieties as well as colorful and beautiful ... With its many different forms, environments, associations and colors, ...

www.softschools.com/facts/geology/calcite_facts/374

Calcite is a very abundant mineral found in the Earth's crust. ... Calcite comes in many different shapes and colors which makes it a popular choice among collectors. ... the amount of CO2 in the ocean by absorbing it to make their calcite shells.