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PhotosCalcite - Muddy Creek, Orderville, Kane Co., Utah, USA

5th Aug 2017 09:48 UTCRalph S Bottrill 🌟 Manager

I note that this image, and a number of others from this site, describe the brown mineral as aragonite, a couple call it siderite, at least one as dolomite, but mostly it's called calcite. Calcite is the only carbonate listed for the site, and seems most likely, but hopefully someone can confirm?

5th Aug 2017 22:09 UTCKelly Nash 🌟 Expert

I don't know anything about this locality, but there seems to be a "convention" that often the initial, brownish layer in "septarian" concretions is called aragonite, I have sometimes seen it reported that way in literature for other locations, but I haven't seen any particular confirmation of it by testing.

6th Aug 2017 16:55 UTCUwe Kolitsch Manager

From my experience it's (nearly) always calcite.

Photo caption says "showing yellow calcite and brown aragonite lines in the center", but the brown phase is certainly also calcite. Message sent.


EDIT: had also sent messages concerning other photos of "non-calcites" from this locality.

7th Aug 2017 15:18 UTCUwe Kolitsch Manager

Karel Bal kindly sent me the following info:



"In response to your recent email I did some research and found this:


The Utah septarians usually have two generations of calcite in them; a brown first-formed layer lining the separated rock fragments, and a later, yellow layer deposited on them, which grades into yellow rhombohedral crystals if the central area remained hollow. The two layers differ in their fluorescence. I have done XRD on both layers of calcite, and in the Utah septarians both are indeed calcite; neither is aragonite as some people have supposed.


Source: http://www.mineral-forum.com/message-board/viewtopic.php?t=383

FMF MINERAL FORUM / Pete Modreski.


Note: The interesting thing about this info is the XRD analysis done on both layers."

7th Aug 2017 23:26 UTCRalph S Bottrill 🌟 Manager

Many thanks Uwe, I will have to see about amending some of these pictures.
 
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