Talk:Chalcedony

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Advertizing deleted. Wikipedia is not for free advertizing. Vsmith 02:45, 9 Feb 2005 (UTC)

Contents

[edit] Varieties Section

I have created a "Varieties" section which systematically considers each variety in turn. It still needs a lot of work (to add a fuller description of each variety), and I will improve on it later. (I have also moved some content into a "History" section.) Hyperdeath (talk) 12:50, 21 March 2008 (UTC)

[edit] 'Blood Stone'

"Plasma is a bright to emerald-green chalcedony that is sometimes found with small spots of jasper resembling blood drops; it has been referred to as blood stone or heliotrope."

Is it possible that the link to haematite (also sometimes known as 'blood stone') is incorrect? As far as I'm aware, haematite does not fit the description of a 'bright to emerald-green chalcedony'.

Done - missed that before, thanks, Vsmith 02:51, 3 January 2006 (UTC)

[edit] etiquette???

Sorry about the posting. I don't know the etiquette of adding things to pre-existing pages. But I'd like to add some basic applied geochemistry to this page if thats possible. Cheers.

[edit] Composition of Chalcedony

The article provides an outdated theory as to chalcedony's composition, namely that it's a form of quartz. It is now known to contain moganite: http://www.mindat.org/min-960.html Hyperdeath 18:00, 27 April 2007 (UTC) (time approximate -- forgot to add signature)

Added a reference for the moganite info. Rickert 03:38, 28 April 2007 (UTC)

I have edited the geochemistry section to reflect the fact that chalcedony and quartz are not crystallographically identical. Hyperdeath 11:37, 29 April 2007 (UTC)

[edit] Varieties

I have cleaned up the varieties section slightly. Hyperdeath 11:37, 29 April 2007 (UTC)