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Specimens from Brasil

Posted by PHAM VAN LONG  
PHAM VAN LONG
Specimens from Brasil
May 06, 2012 05:59AM
Dear All,
I bought some specimens in Brasil during my holliday there. But I dont know what kind of minerals are they?
Please help me???
Thank in advance!
Long









Edited 1 time(s). Last edit at 05/06/2012 10:21AM by Debbie Woolf.
PHAM VAN LONG
Re: Specimens from Brasil
May 06, 2012 06:07AM
Here are some more pieces?









Edited 1 time(s). Last edit at 05/06/2012 10:21AM by Debbie Woolf.
PHAM VAN LONG
Re: Specimens from Brasil
May 06, 2012 06:10AM
More two pieces?









Edited 1 time(s). Last edit at 05/06/2012 10:22AM by Debbie Woolf.
avatar Re: Specimens from Brasil
May 06, 2012 04:44PM
I think most of your specimens are various zeolite and related minerals from India. They are very cheap on the world market and have found their way to Brazil and other places. The first one is a stilbite possibly from the Nasik Region. Why in the world didn't you ask what they were and where they were from when you bought them?

Your M5.jpg is a quartz cast after anhydrite from Iraí, Alto Uruguai region, Rio Grande do Sul, Brazil. Probably the best specimen in the lot.

Rock Currier
Crystals not pistols.
Jean-Michel Trillaud
Re: Specimens from Brasil
May 06, 2012 05:45PM
M6.jpg :
Thomsonite from Aurangabad, India

Regards

JM Trillaud
PHAM VAN LONG
Re: Specimens from Brasil
May 07, 2012 03:00AM
Thank you all for your help.
I bought them at a tourist center, and I aksed them what they were? But they told me all are calcite minerals and I dont believe it.
Samples M4 and M8 are grayish green color, some place are in yellow, they told me it was diopside? but I am not sure? and I also dont think they are zeolite minerals?
Please help me if you know?
Regards,
Long
Re: Specimens from Brasil
May 07, 2012 08:17AM
No, Rock is right, they are all zeolites from India, there is no diopside there!

Spencer
Re: Specimens from Brasil
May 07, 2012 09:46AM
    
Pham,
M2 looks like mordenite on stilbite to me.

Alan
avatar Re: Specimens from Brasil
May 07, 2012 04:36PM
M8.jpg and M8-2.jpg appear to be both weathered heulandite possibly from the Pune area. Usually no one bothers picking up such stuff.

Rock Currier
Crystals not pistols.
avatar Re: Specimens from Brasil
May 07, 2012 04:50PM
M2.jpe and M2-1 appear to be weathered mordenite or scolecite on stilbite, but you would have to have it checked to be sure. Probably from the Nasik or Jalgaon regions. There are thousands of quarries in India in the region of the Deccan traps. When the British were thrown out so were their forestry laws, and most of the trees have been cut down. What does that have to do with zeolites and the related species found in the Deccan traps? Well, if you cut down most of the trees, you don't have anything much left to build with except the basalt of the Deccan traps to use as building material, so you make a little quarry or tow or three near every town and a surprising percentage of these will produce specimens. The population density in India is quite high so there are a huge number of quarries. Many of which don't even have names.

Because of the high population density, a lot of water is needed for drinking and washing. Again what does this have to do with mineral specimens. The wells in this part of India are not like the wells we are familiar with in the west. They are often at least twenty or more feet across and will extend down into the basalt fifty or more feet, well below the water table. The basalt is slowly permeable and water from the basalt below the water level will gradually fill these wells. The recharge time is somewhat variable, but in digging/blasting these wells, sometimes very large pockets zeolite and related minerals are encountered.

Rock Currier
Crystals not pistols.



Edited 1 time(s). Last edit at 05/07/2012 04:52PM by Rock Currier.
avatar Re: Specimens from Brasil
May 07, 2012 04:54PM
M4.jpg and M4-1.jpg appear to be severely weathered stilbite. Possibly from the Nasik region. The quarries near Pune and Bombay usually produce white stilbite. Some one from Brazil must have bought a lot of the cheapest rubbish possible and sent it to Brazil for tourists. I really do like to try and help newbies but after about the 1000th time doing so and usually they get pissed of when you tell them the truth, you start to wonder why you are wasting your time. Yes, I'm getting to be a grouchy old man.

Rock Currier
Crystals not pistols.



Edited 1 time(s). Last edit at 05/07/2012 04:58PM by Rock Currier.
PHAM VAN LONG
Re: Specimens from Brasil
May 08, 2012 06:38AM
Thank you Mr. Currier for your explaination, they are very usefull to me.
I also bought some more specimens at the same place (S1, S2, S5 Brasil). Samples number S3 and S4 from China? Could you please feel free to let me know, what they are?
Regards,
Long
Attachments:
open | download - S1-2.jpg (129.9 KB)
open | download - S1.jpg (137.7 KB)
open | download - S2-2.jpg (132.2 KB)
PHAM VAN LONG
Re: Specimens from Brasil
May 08, 2012 06:41AM
Here are more pictures?
Attachments:
open | download - S2.jpg (156.9 KB)
open | download - S3-2.jpg (97.1 KB)
open | download - S3.jpg (165.5 KB)
PHAM VAN LONG
Re: Specimens from Brasil
May 08, 2012 06:43AM
More pictures?
Attachments:
open | download - S4-2.jpg (63.4 KB)
open | download - S4.jpg (101.9 KB)
open | download - S5.jpg (145.1 KB)
avatar Re: Specimens from Brasil
May 08, 2012 07:11AM
S2.jpg is Okenite on drusy quartz with small balls of gyrolite and small very pale green balls of prehnite from Malad, India near Bombay. As for the other two, show us an image of the entire specimen.

Rock Currier
Crystals not pistols.
avatar Re: Specimens from Brasil
May 08, 2012 07:12AM
Show us pictures of the entire specimens.

Rock Currier
Crystals not pistols.
PHAM VAN LONG
Re: Specimens from Brasil
May 08, 2012 07:52AM
Hi Mr. Currier,
Here are pictures of entire samples S1, S2, S3?
Regards,
Long
Attachments:
open | download - S1 entire.jpg (209 KB)
open | download - S2 entire.jpg (268.8 KB)
open | download - S3 entire.jpg (177.1 KB)
PHAM VAN LONG
Re: Specimens from Brasil
May 08, 2012 07:54AM
S4 and S5?
Attachments:
open | download - S4 entire.jpg (115.7 KB)
open | download - S5 entire.jpg (193.3 KB)
Jean-Michel Trillaud
Re: Specimens from Brasil
May 08, 2012 11:44AM
Hi

S5.jpg : Apophyllite from Maharashtra, India (probably exactly from Nasik)

Regards

Jean-Michel Trillaud
Jean-Michel TRILLAUD
Re: Specimens from Brasil
May 08, 2012 11:52AM
Hi again

S1.jpg (the pinkish Xtals among whitish microxxls) :
At first glance, would look like 'heulandite' regarding the color.

But, in fact not : it's definitely a STILBITE regarding the crystallography

--> STILBITE on calcedony matrix, or possibly micro xx of quartz.

Location : probably from Nasik , Maharashtra, INDIA

Regards

JM
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