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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 Supreme ... Limestone blocks were the primary construction material used in many of the ... Small amounts of calcium carbonate are often added to their feeds to ...

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.mindat.org/min-859.html

A very common and widespread mineral with highly variable forms and colours. Calcite is best recognized by its relatively low Mohs hardness (3) and its high reactivity ... or prismatic with scalenohedral terminations, or combinations of the two.

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.

www.britannica.com/science/calcite

Apr 25, 2013 ... It is polymorphous (same chemical formula but different crystal structure) with ... The carbonate minerals calcite, aragonite, and dolomite have been calculated ... bromine [Br], Sr, and/or Y), substituting for some of their calcium.

flexiblelearning.auckland.ac.nz/rocks_minerals/minerals/calcite.html

Calcite is the only common non-silicate rock forming mineral, being instead calcium carbonate. ... Calcite is a common vein filling mineral in many rock types.

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, ...