Calcite

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Calcite.jpg
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 seashells are made of calcite or related minerals. This is the 'lime' of limestone.[1]

References

  1. http://wrgis.wr.usgs.gov/docs/parks/rxmin/mineral.html#amphibole
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