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  1. An orthorhombic mineral, 4[CaCO3 ] ; acicular, pyramidal, tabular, reniform, columnar, or stalactitic habit; formed from hot carbonated water in springs, cavities in basalt, or biogenetically in shells and pearls (mother of pearl). Syn: aragon spar
  2. The mineral group aragonite, cerussite, strontianite, and witherite.
    Source: Dictionary of Mining, Mineral, and Related Terms

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