Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic Time
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Identity HelpSpecimens from Brasil

6th May 2012 06:59 UTCPHAM VAN LONG

00374560016061474232171.jpg
Copyright © mindat.org
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



03674080016061474236815.jpg


03824980016061474248286.jpg

6th May 2012 07:07 UTCPHAM VAN LONG

04620070016061474253338.jpg
Copyright © mindat.org
Here are some more pieces?



06151060016061474259898.jpg


00950850016061474267330.jpg

6th May 2012 07:10 UTCPHAM VAN LONG

05432170016061474261844.jpg
Copyright © mindat.org
More two pieces?



06057190016061474269633.jpg


00145980016061474278487.jpg

6th May 2012 17:44 UTCRock Currier Expert

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.

6th May 2012 18:45 UTCJean-Michel Trillaud

M6.jpg :

Thomsonite from Aurangabad, India


Regards


JM Trillaud

7th May 2012 04:00 UTCPHAM VAN LONG

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

7th May 2012 09:17 UTCSpencer Ivan Mather

No, Rock is right, they are all zeolites from India, there is no diopside there!


Spencer

7th May 2012 10:46 UTCAlan Barnes (2)

Pham,

M2 looks like mordenite on stilbite to me.


Alan

7th May 2012 17:36 UTCRock Currier Expert

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.

7th May 2012 17:50 UTCRock Currier Expert

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.

7th May 2012 17:54 UTCRock Currier Expert

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.

8th May 2012 07:38 UTCPHAM VAN LONG

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

8th May 2012 07:41 UTCPHAM VAN LONG

Here are more pictures?

8th May 2012 07:43 UTCPHAM VAN LONG

More pictures?

8th May 2012 08:11 UTCRock Currier Expert

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.

8th May 2012 08:12 UTCRock Currier Expert

Show us pictures of the entire specimens.

8th May 2012 08:52 UTCPHAM VAN LONG

Hi Mr. Currier,

Here are pictures of entire samples S1, S2, S3?

Regards,

Long

8th May 2012 08:54 UTCPHAM VAN LONG

S4 and S5?

8th May 2012 12:44 UTCJean-Michel Trillaud

Hi


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


Regards


Jean-Michel Trillaud

8th May 2012 12:52 UTCJean-Michel TRILLAUD

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

8th May 2012 21:44 UTCRock Currier Expert

S1 Stilbite on quartz, Nasik or Jalgaon regions

S2 Okanite, Malad, India

S3 Cerussite? China?

S4 Aragonite? Calcite? China?

S5 Apophyllite-(KF) Nasik region?

9th May 2012 09:30 UTCPHAM VAN LONG

Hi Mr. Currier,

Thank you for your suggestion.

Sample S4 are similar to sample M3 here, and I it is not look like aragonite or calcite?

Some people told me it is smithsonit? but I am not sure?

Regards,

Long

9th May 2012 12:39 UTCTom Klinepeter

Hi,

The specimen you think might be smithsonite(s-4) is calcite or aragonite as Rock has identified but not smithsonite.

Hope this help.

Tom

11th May 2012 08:24 UTCPHAM VAN LONG

Hi all,

Thank you very much for your help and comment.

I also bought this piece in Brasil, please help me to identify it,what?

Regards,

Long

11th May 2012 08:39 UTCRock Currier Expert

Green heulandite on weathered stilbite? I don't think its from the Bombay area, but that leaves a lot of places it could be from. If you upload it to our general gallery, our Indian zeolite expert Fasi Makki will look at it and he may be able to put a good locality on it.

11th May 2012 12:18 UTCPHAM VAN LONG

Hi Mr. Currier,

Thank you for ypur help, but how can I upload to your general gallery?

Regards,

Long

11th May 2012 17:56 UTCRock Currier Expert

Pham, here are instructions about how to upload images to Mindat.


First however you must register with mindat as a member. There is not cost to do this.
 
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
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: March 19, 2024 09:05:16
Go to top of page