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Identity HelpMagnetic pseudomorph?
1st Jun 2011 02:24 UTCNik Nikiforou
1st Jun 2011 02:27 UTCNik Nikiforou
1st Jun 2011 06:39 UTCMickey Marks
1st Jun 2011 11:04 UTCPeter Haas
1st Jun 2011 18:53 UTCRock Currier Expert
1st Jun 2011 21:17 UTCNik Nikiforou
Thanks,
Nik
2nd Jun 2011 11:09 UTCRock Currier Expert
2nd Jun 2011 13:48 UTCNik Nikiforou
Nik Nikiforou
2nd Jun 2011 13:57 UTCPeter Haas
3rd Jun 2011 13:11 UTCRock Currier Expert
3rd Jun 2011 17:17 UTCMatt Neuzil Expert
3rd Jun 2011 20:26 UTCRock Currier Expert
8th Jun 2011 00:30 UTCDana Slaughter 🌟 Expert
I just obtained four of these Pakistani epidote specimens yesterday and observed that mine were magnetic as well. I found a reference to a 1944 paper entitled "The Magnetic Properties of Tourmaline and Epidote" by A. Sigamony. Apparently, this
characteristic isn't as unusual as one might imagine--certainly I never considered magnetism in epidote!
Dana
8th Jun 2011 00:45 UTCNik Nikiforou
Article abstract
By the way, do you have a specific locality for your specimens?
Thanks,
Nik Nikiforou
8th Jun 2011 03:09 UTCDana Slaughter 🌟 Expert
Yes, the nearest town or city to the presumed locality (being kept somewhat secret at the moment) is Quetta, Balochistan (Baluchistan), Pakistan. I was quite surprised to find that my specimens were mildly to moderately magnetic and I was unaware of any reaction to a magnet with the mineral. I think that these are fabulous specimens--especially to all of us dark mineral-addicted collectors out there! I hope all is well and I wish you continued success!
Take care,
Dana
8th Jun 2011 05:29 UTCSteve Hardinger 🌟 Expert
8th Jun 2011 17:04 UTCRock Currier Expert
9th Jun 2011 19:18 UTCNik Nikiforou
9th Jun 2011 22:27 UTCMichael Hatskel
Please double-check: the abstract you are referencing (actually the intro portion of the paper) says 4-17% ferric oxide, i.e. Fe2O3, not ferrous oxide FeO.
Epidote occurs together with magnetite so often that it should not be very difficult to imagine microcrystals of magnetite included in such large epidote crystals. Could it be that as a later formed mineral, epidote incorporated some earlier formed magnetite crystals?
Also, does your specimen show magnetism all way around it or it is localized in some spots?
9th Jun 2011 22:44 UTCRob Woodside 🌟 Manager
10th Jun 2011 00:28 UTCMichael Hatskel
It may be possible, if 1-2%wt FeO is sufficient for creating a weak but perceptible magnetism.
I just don't know if that is sufficient.
10th Jun 2011 01:36 UTCNik Nikiforou
10th Jun 2011 02:41 UTCGary Moldovany
12th Jan 2012 22:04 UTCNauroz Nausherwani
I will soon going be for collecting these specimens . I will post locality pictures in my mindat gallery so they can help you people. Keep visiting my mindat gallery.
Nauroz Nausherwani
Nausherwani Mines, Kharan,Balochistan
13th Jan 2012 01:28 UTCReiner Mielke Expert
13th Jan 2012 08:49 UTCRock Currier Expert
13th Jan 2012 10:52 UTCNauroz Nausherwani
ROck Currier please inform us when you got reply from your friend.
Nauroz Nausherwani
13th Jan 2012 13:20 UTCJohan Kjellman Expert
Be aware though, that the "magnetism" referred to in the article is paramagnetism as opposed to the ferromagnetic properties that the pakistani epidotes exhibit.
I got a couple of crystals in Munich and there are both magnetic and nonmagnetic crystals around.
Some dealers in munich used the magnetic properties and the "unusal" octahedral morphology as a sales pitch for promoting the crystals. Others called them pseudomorphic after magnetite, referring to the "octahedrons" as showing the outer morphology of the "original" mineral magnetite.
This is of course not true as the octahedral morphology of these epidotes doesn't display any cubic symmetry.
My conclusion from the above facts are that they are "just" epidotes with a somewhat unusual morphology, carrying inclusions of a ferromagnetic mineral, magnetite? being the most likely candidate, in proportions from zero and upwards.
cheers
13th Jan 2012 16:26 UTCHarald Schillhammer Expert
Here's a rough and dirty photo of the surface (FOV ca. 10mm) - click on the image for a larger and sharper view:
http://www.pbase.com/rovebeetle/image/140888810/original.jpg
Cheers
13th Jan 2012 17:14 UTCNik Nikiforou
http://www.mineralnews.com/backissue_11.htm
I haven't read it but in a conversation with Tony Nikischer he told me that tiny particles of Magnetite were found inside of the crystals. I'm not sure what kind of analysis was done, but I'm sure that the article goes into detail on that.
Best regards,
Nik
15th Jan 2012 03:31 UTCLloyd Van Duzen Expert
24th Feb 2012 19:33 UTCNauroz Nausherwani
To my recent visit to these Epidote deposits at Luss,Raskoh Mountain,Kharan,Balochistan I have found that the whole Raskoh Mountain is made of Granite and magnetite is present in the Granite. So I became certain that epidote from this locality is magnetic because of mother rock Granite with magnitite. Take a look at locality pictures on
http://www.mindat.org/user-13658.html#2
and video at
http://www.youtube.com/watch?v=2RuX4AgQHqM
Thanks,
Nauroz Nausherwani
24th Feb 2012 19:33 UTCNauroz Nausherwani
To my recent visit to these Epidote deposits at Luss,Raskoh Mountain,Kharan,Balochistan I have found that the whole Raskoh Mountain is made of Granite and magnetite is present in the Granite. So I became certain that epidote from this locality is magnetic because of mother rock Granite with magnitite. Take a look at locality pictures on
http://www.mindat.org/user-13658.html#2
and video at
http://www.youtube.com/watch?v=2RuX4AgQHqM
Thanks,
Nauroz Nausherwani
25th Feb 2012 01:48 UTCRobert Simonoff
Bob
25th Feb 2012 02:06 UTCbill wall
25th Feb 2012 02:55 UTCRobert Simonoff
Bob
25th Feb 2012 03:32 UTCAlfredo Petrov Manager
Very weird stuff; get them while they last (no, I don't have any). :-(
25th Feb 2012 15:45 UTCR. Peter Richards Expert
25th Feb 2012 16:55 UTCNik Nikiforou
26th Feb 2012 01:40 UTCJosé Zendrera 🌟 Manager
Nauroz, very thanks for posting your Raskoh Mts. locality pics, are very interesting and instructive showing geological details. In pictures can see many types of rocks from granite to limestone and several grade metamorphic rocks, some with metasomatic mineralization. Please let me comment some of your photos:
This look sedimentary rocks, perhaps limestone or sandstone with some grade of metamorphism. Cyclic stratification appears to show flysh type sediments alternating hard and soft materials.
Here can see dark metamorphic rocks crossed by granite or diorite intrusions, all well stirred and folded. Please let me know if the find is near the contact between both rocks.
That look as metamorphic flysh materials but granite is not far at all as seen behind them.
26th Feb 2012 01:59 UTCJosé Zendrera 🌟 Manager
Graphic demonstration of the magnetic properties:
Epidote - clinozoisite, diopside and magnetite from unknown locality also in Pakistan (received without label as a gift from a Pakistani dealer). This is an alpine type growth, completely different to metasomatic transformation origin of related magnetic pseudo-octahedral Raskoh epidote.
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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 17:24:01