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Improving Mindat.orglepidocrocite photo-684198.html

21st May 2015 15:53 UTCTom Mortimer Expert

03341090016020565469433.jpg
The lepidocrocite in quartz photo -684198.html shows 'ledidocrocite' in quartz, yet the mindat ledidocrocite page states:

"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

message sent

21st May 2015 16:53 UTCPascal Chollet Expert

Hi


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

-- moved topic --

21st May 2015 18:32 UTCRob Woodside 🌟 Manager

Merci Pascal

21st May 2015 22:32 UTCcascaillou

Known misrepresentations (discredited by lab analysis, sources: Photoatlas vol.1 and vol.2, and the book Inclusions in Quartz):

-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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