Selected Minerals – Today: Aragonite

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°

aragonite-196792

Picture: Rob Lavinsky, iRocks.com – CC BY-SA 3.0


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

aragonite

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

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