Incorporation of Al , Mg , and water in opal - A : Evidence from speleothems

  • JonN A. Wrsn
  • Published 2007


Opal-A speleothems from a variety of caves show a wide range of composition, containing up to 50/o AlrO, and MgO. The infrared spectra of the samples show that the Al is substituting for Si, with OH groups compensating for the resultant charge imbalance. The Mg occurs as interstitial ions to which OH groups are bonded to balance the charge. Thus the… (More)


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