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Techniques for Collectorsremoving calcite from apatite
19th Jul 2006 15:12 UTCPhil B.
Thanks, Phil.
19th Jul 2006 16:18 UTCAlfredo Petrov Manager
I've heard that some collectors expose the long fragile Bancroft area apatites from its coarse calcite by mechanical means after first reinforcing the fragile fractured apatites with glue.
19th Jul 2006 17:04 UTCPhil B.
Phil.
19th Jul 2006 17:45 UTCPeter Haas
- First, it is a weaker acid - a dilute solution will not attack apatite.
- Second, it acts only as an acid. Citrate also acts as a chelant (i.e. a multidentate complex ligand) with a pronounced selectivity towards Ca2+, Mg2+, Fe2+ and other ions of similar size. In general, complexation - especially when multidentate ligands are involved (entropy gain) - is independent on the pH value. Citric acid/citrate will attack apatite after prolonged exposition.
Please note, that calcite is very slowly dissolved by acetic acid. On the other hand, this helps to control even a delicate etching job.
20th Jul 2006 01:16 UTCPhil B.
Thanks, Phil.
20th Jul 2006 03:42 UTCPaul L. Boyer
20th Jul 2006 13:02 UTCPhil B.
Phil
29th Jul 2006 08:26 UTCZbynek Burival Expert
My friend was cleaning Slyudyankas apatites with dilluted hydrochloric acid and they stay undamaged if they are not washed too long. If they are in contact with acid too long they loose color to very slightly blue or white. But HCl is not the way to follow;)
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