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[[Image:Calcite.jpg|thumb|300px]]'''Calcite''' is made of [[calcium carbonate]] (CaCO3). Generally [[white]] to [[clear]], it is easily scratched with knife. Most [[seashell]]s are made of calcite or related minerals. This is the 'lime' of [[limestone]].<ref>http://wrgis.wr.usgs.gov/docs/parks/rxmin/mineral.html#amphibole</ref>

[[Image:Calcite.jpg|thumb|300px]]'''Calcite''' is made of [[calcium carbonate]] (CaCO3). Generally [[white]] to [[clear]], it is easily scratched with knife. Calcite is number 3 on the [[Mohs Hardness Scale]]. Most [[seashell]]s are made of calcite or related minerals. This is the 'lime' of [[limestone]].<ref>http://wrgis.wr.usgs.gov/docs/parks/rxmin/mineral.html#amphibole</ref>

==References==

==References==