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A general guide for using the Forum with some rules and tips
Struggling to identify the green mineral
  
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Joanna89




Joined: 24 Jun 2017
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PostPosted: Jun 24, 2017 12:12    Post subject: Struggling to identify the green mineral  

Hi,

We have bought a limestone tray in the shop. There was only one with mineral vein cutting across. It is a limestone tray with green mineral filling the vein, together with sulphides.

I'm geologist and have identified sulphides as chalcopyrite and sphalerite, but struggling to identify the green mineral. The vein is appx 4 cm in width.

Please see the picture attached.



IMG_9444.JPG
 Mineral: Uncertain
 Locality:
India
 Dimensions: 2-3
 Description:
 Viewed:  1825 Time(s)

IMG_9444.JPG


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Bob Carnein




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PostPosted: Jun 24, 2017 14:11    Post subject: Re: Struggling to identify the green mineral  

Actinolite is a possibility; you might want to look up its physical properties and do some tests.
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Bob Harman




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PostPosted: Jun 24, 2017 20:16    Post subject: Re: Struggling to identify the green mineral  

BOB, The poster clearly stated that she had "bought a limestone tray". And now you suggest Doing some tests !!!??? What is the poster to do .....chip out some of the green areas from her tray, essentially ruining it, doing a scratch test on a green area of the tray, or pouring acid on the tray ruining it, or?
As a collector, on some similar type postings, I sometimes wonder about some mineralogists and geologists not seeing the forest for the trees. Let's be pragmatic and real about this. Identifying a mineral on a decorative object has its limitations. Identification might be limited to the photo (or in person) appearance and not much more. BOB
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Dale Hallmark




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PostPosted: Jun 24, 2017 21:21    Post subject: Re: Struggling to identify the green mineral  

Looks like Marble to me instead of Limestone. Don't know what the Green stuff is but green is common in marbles. I don't recall seeing anything green In limestone's before but doesn't surprise me it could happen. Never thought about it.

Dale
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Dale Hallmark




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PostPosted: Jun 24, 2017 21:27    Post subject: Re: Struggling to identify the green mineral  

Green might be Serpentine? maybe.

Dale
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lluis




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PostPosted: Jun 25, 2017 02:16    Post subject: Re: Struggling to identify the green mineral  

Dear Bob Harman

Well, if you wish to identify a mineral from a somewhere place in a matrix of anything, without any clear enough (to my eyes at least) crystal form to be seen, and without any test, identification would be "any mineral".

Guessing is not identifying.
And to guess is not to identify
And, unfortunately for us, chemists, mineralogists and collectors are not wizards that can identify correctly without any data...
I said that several times, but I have also a sub-collection of formerly bad identified minerals, now correctly attributed (some, with new analysis. Others, just with the correct interpretation of former analysis).
One, my preferred one, from a very expert collector, with three labels.... First, placing ruby. Next, from the big collector, saying zircon. And last, with analysis that says it is a pyrope garnet. Locality, unfortunately is not very precise.... "California, USA"....

With best wishes

Lluís
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Peter Lemkin




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PostPosted: Jun 25, 2017 02:44    Post subject: Re: Struggling to identify the green mineral  

Bob Harman wrote:
BOB, The poster clearly stated that she had "bought a limestone tray". And now you suggest Doing some tests !!!??? What is the poster to do .....chip out some of the green areas from her tray, essentially ruining it, doing a scratch test on a green area of the tray, or pouring acid on the tray ruining it, or?
As a collector, on some similar type postings, I sometimes wonder about some mineralogists and geologists not seeing the forest for the trees. Let's be pragmatic and real about this. Identifying a mineral on a decorative object has its limitations. Identification might be limited to the photo (or in person) appearance and not much more. BOB


Good points, but on a tray perhaps [unknown] the same green mineral bands might be seen on the bottom and thus be available for an few tests without harming the object. Many amateurs or the mineral naive usually do not realize how many minerals can mimic other minerals and how, sometimes, it takes a lot of work and time - or is impossible - to decide which of many possibilities it is without the most sophisticated tests, only available in university or research settings. While 99+% of the minerals in my collection are identified and labeled, some that were self-found or given to me are still listed as likely one of several possibilities. Location often helps, but a tray's location is likely not known. Sometimes one has to settle for not knowing or knowing the list of possible things it could be.
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Bob Carnein




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PostPosted: Jun 25, 2017 09:49    Post subject: Re: Struggling to identify the green mineral  

Bob Harman wrote:
BOB, The poster clearly stated that she had "bought a limestone tray". And now you suggest Doing some tests !!!??? What is the poster to do .....chip out some of the green areas from her tray, essentially ruining it, doing a scratch test on a green area of the tray, or pouring acid on the tray ruining it, or?
As a collector, on some similar type postings, I sometimes wonder about some mineralogists and geologists not seeing the forest for the trees. Let's be pragmatic and real about this. Identifying a mineral on a decorative object has its limitations. Identification might be limited to the photo (or in person) appearance and not much more. BOB


Sorry to suggest we're interested in science here. Maybe this isn't the appropriate place for the question. But, it seems to me that doing some careful testing on the back of the tray wouldn't hurt anything? I wasn't suggesting she knock off a chunk and run it through a fire assay.
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Josele




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PostPosted: Jun 25, 2017 11:07    Post subject: Re: Struggling to identify the green mineral  

Diopside?
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Volkmar Stingl




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PostPosted: Jun 25, 2017 12:35    Post subject: Re: Struggling to identify the green mineral  

Tremolite?
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Jordi Fabre
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PostPosted: Jun 26, 2017 05:39    Post subject: Re: Struggling to identify the green mineral  

Bob Carnein wrote:
...Sorry to suggest we're interested in science here...

Please no sorry for this Bob, and welcome all your requests!

In fact the position of the administrators of this Forum about the identification of minerals is reflected in the point 7 of A general guide for using the Forum with some rules and tips :

7.-) If you need help in identifying a mineral then please follow the recommendations given in the ‘Style Guide’ of the section ‘What is this?’ that you can read by following this link
If you want to work out the specific gravity of a specimen then this explanation: DIY Specific Gravity Kit, is very useful and can be read by following this link
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Vinoterapia




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PostPosted: Jun 29, 2017 08:08    Post subject: Re: Struggling to identify the green mineral  

I would add Chlorite to the suggestions.
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markbeckett




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PostPosted: Jul 01, 2017 10:59    Post subject: Re: Struggling to identify the green mineral  

Maybe Epidote?? depending on its host rock associations?? (Definately try experimenting on bottom of the tray - presumably the 'green vein' can be found there too). Thanks for read.
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lluis




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PostPosted: Jul 01, 2017 13:10    Post subject: Re: Struggling to identify the green mineral  

I would say any green mineral (not necessarily proper color, just that could be in green)...
No place, no analysis, no nothing, no more concretion. Wonders could be had in the magicians forum, any place out from this..... Sorry, not magician.

Lluís
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