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406
MineralsAtacamite
27th Dec 2011 10:17 UTCErik Vercammen Expert
27th Dec 2011 10:56 UTCLefteris Rantos Expert
Although long considered as the rhombohedral polymorph of Atacamite, Paratacamite has been recently shown to contain essential Zinc, in part replacing Copper in one position and helping stabilize the trigonal cell. This prevents it from being a polymorph of Atacamite. In this context, it's the Cu-dominant analogue of Herbertsmithite, Haydeeite and Gillardite.
Lefteris.
27th Dec 2011 11:17 UTCErik Vercammen Expert
Best wishes for 2012, and thanks for the info. It should be put on the atacamite page also, for this is new and a lot of amateurs like myself may have the same reaction about paratacamite being 'forgotten'.
27th Dec 2011 14:22 UTCReiner Mielke Expert
27th Dec 2011 15:04 UTCLefteris Rantos Expert
If I remember correctly, it was Uwe Kolitsch that brought up the matter of Zn content in Paratacamite in a discussion some time ago, before the mindat page was updated. Maybe he would know.
However, I believe that the discovery and description of several new species in the Atacamite group recently, has brought some changes in the understanding of the crystal chemistry and structures within the group.
Lefteris.
27th Dec 2011 16:07 UTCReiner Mielke Expert
27th Dec 2011 22:42 UTCLefteris Rantos Expert
Lefteris.
26th Feb 2012 11:52 UTCChris Deroo
http://books.google.be/books?id=c4g5AAAAcAAJ&printsec=frontcover&hl=nl&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
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Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 19, 2024 22:36:05