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Improving Mindat.orglepidocrocite photo-684198.html
21st May 2015 15:53 UTCTom Mortimer Expert
"The red inclusions in many quartz crystals, often labelled by sellers as "lepidocrocite", are in fact normally hematite. We are unaware of any analytically confirmed red translucent scaly lepidocrocite as inclusions in quartz crystals. Likewise, colourfully iridescent mammillary "turgite" crusts are sometimes sold as "lepidocrocite" but are usually goethite."
This begs the question: How was the determination made for the specimen shown in photo 684198?
A similar mineral occurrence has been found at Center Ossipee, NH, USA, as shown in the attached photo, (5 mm field of view). Based in part on the above mindat statement, collectors have been labeling these inclusions as hematite.
Tom Mortimer
21st May 2015 16:04 UTCRob Woodside 🌟 Manager
21st May 2015 16:53 UTCPascal Chollet Expert
Hematite was my first opinion. but I saw such samples from this locality called lepidocrocite in magazines, so I called it the same.
Fixed now.
I also added lepidocrocite to the mineral list while uploading the photo. I have changed it to "erroneously reported", with a link to this page as comment.
Regards
Pascal
21st May 2015 17:18 UTCTom Mortimer Expert
21st May 2015 18:32 UTCRob Woodside 🌟 Manager
21st May 2015 22:32 UTCcascaillou
-cacoxenite inclusions in quartz are actually goethite inclusions
-lepidocrocite inclusions in quartz are actually hematite inclusions
-hedenbergite inclusions in green prasem quartz are actually mostly actinolitic amphibole inclusions
I also have doubts about so-called celadonite inclusions in quartz from madagascar, which to my knowledge have never been confirmed by any analysis (so these could possibly be another green mica group mineral, or even some chlorite group mineral).
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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: April 25, 2024 17:11:15