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Identity HelpHELP WITH ZEOLITE IDENTIFICATION
30th Oct 2011 16:11 UTCTrevor Boyd
I recently visited a new zeolite locality at the Garron Plateau, County Antrim Northern Ireland and have found some specimens which i am unsure of.
The photos 1 and 1a show white elongated crystals approximately 3 mm long in association with clear analcime. Terminations are very irregular although the crystals seem to have a triangular cross section.
Photo 2 shows a white crystal approximately 4mm long on Thomsonite. I'm guessing it is Phillipsite but your opinions on both minerals are as always greatly appreciated.
Many thanks
Trevor
30th Oct 2011 17:15 UTCFerdinando Giovine
For the first, if the section is triangular, is possible a trigonal specie.
Ciao
Ferdinando
30th Oct 2011 18:09 UTCGeorge Creighton
Just my opinion for what it`s worth.
Think that photo2 resembles the zeolite " harmotome ".
Or is a member of the harmotone - phillipsite series.
Well worth looking into these options.
Hope this helps good luck.
Regards george
30th Oct 2011 19:29 UTCRob Woodside 🌟 Manager
30th Oct 2011 20:04 UTCFerdinando Giovine
30th Oct 2011 20:21 UTCGeorge Creighton
Trevor ( Re photo 1 ) stated in post 1 that:-
Terminations are very irregular although the crystals seem to have a triangular cross section.
So open for discussion.
Just my point of view.
Regards george
31st Oct 2011 02:07 UTCRobert Meyer Manager
Bob Meyer
31st Oct 2011 03:28 UTCWolfgang Hampel 🌟 Expert
For Photo 2 I'd say apophyllite on either thomsonite or prehnite. Photo 1, some sort of pseudomorph after laumontite.
Regards, Wolfgang
31st Oct 2011 10:42 UTCKrzysztof Andrzejewski
31st Oct 2011 12:57 UTCRonnie Van Dommelen 🌟 Manager
31st Oct 2011 14:04 UTCTrevor Boyd
Thanks so much for all of your contributions. Apologies also as I should have carried out the HCl test at the start!! However I have done it now and it would seem that specimen 1 is indeed a variety of calcite, although not one I have previously seen before.
Specimen 2 shows no reaction to the HCl. Unfortunately I cant really get an alternative view of the initial crystal however I have attached two other photos showing multiple full and partial crystals which hopefully may prove useful.
Many thanks again to all.
Trevor
31st Oct 2011 14:28 UTCVolker Betz 🌟 Expert
specimen 2 is clearly Apophyllite on a crust of Thomsonite. Typical paragenesis for the area.
Regards
Volker
31st Oct 2011 18:04 UTCKrzysztof Andrzejewski
- honestly I will be very surprised, Ca-rich zeolites can react with HCl.
31st Oct 2011 18:32 UTCUwe Kolitsch Manager
I agree with Volker.
The prismatic white mineral (specimen 1) looks like calcite to me.
31st Oct 2011 19:57 UTCTrevor Boyd
Regards,
Trevor
1st Nov 2011 07:59 UTCFerdinando Giovine
for the first Calcite is a trigonal specie! X(
19th Aug 2012 20:15 UTCchigos
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Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: May 4, 2024 10:25:36