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PhotosCalcite - Muddy Creek, Orderville, Kane Co., Utah, USA
5th Aug 2017 09:48 UTCRalph S Bottrill 🌟 Manager
5th Aug 2017 22:09 UTCKelly Nash 🌟 Expert
6th Aug 2017 16:55 UTCUwe Kolitsch Manager
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
"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
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: March 29, 2024 14:35:59