Selected Minerals – Today: Aragonite


  • Named after the type locality Aragon (Spain)
  • One of the two naturally occuring forms of calcium carbonate (the other being calcite)
  • Formula: CaCO3
  • Space group: Pmcn (No. 62)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters: a = 4.95 Å, b = 7.96 Å, c = 5.74, αβγ = 90°


Picture: Rob Lavinsky, – CC BY-SA 3.0

Crystal structure (click on the picture to download the VESTA file):


CO3 triangles (black), CaO9 irregular polyhedra (blue)


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