If you find errors or mistakes in mindat.org, let me know here http://www.mindat.org/msgboard-7.html Thu, 26 Nov 2009 07:21:51 +0000 Phorum 5.2.8-RC1 http://www.mindat.org/forum.php?read,7,161493,161493#msg-161493 http://www.mindat.org/forum.php?read,7,161493,161493#msg-161493

© Rob Lavinsky

© Russell G. Rizzo

These are not from Dugway but from Muddy Creek, Orderville, Kane Co., Utah.]]> Rick Dalrymple Mistakes and Errors Thu, 26 Nov 2009 04:23:41 +0000 http://www.mindat.org/forum.php?read,7,161440,161478#msg-161478 http://www.mindat.org/forum.php?read,7,161440,161478#msg-161478
Best regards
Tom]]> Tomasz Praszkier Mistakes and Errors Thu, 26 Nov 2009 00:10:34 +0000 http://www.mindat.org/forum.php?read,7,161440,161466#msg-161466 http://www.mindat.org/forum.php?read,7,161440,161466#msg-161466 sorry to disagree but to me it looks like Bou Be(c)ker (near Touissite). Have myself a lot of Oumjrane, Bou Beker, Aouli and Kerrouchene...
For me quite typical for finds about 2 to 3 years ago and earlier from Oujda region.

cheers
Roger]]> Roger Lang Mistakes and Errors Wed, 25 Nov 2009 22:30:17 +0000 http://www.mindat.org/forum.php?read,7,161456,161456#msg-161456 http://www.mindat.org/forum.php?read,7,161456,161456#msg-161456
[www.mindat.org] appears to be a mislabeled Bloodstone.

MRH]]> Mark Heintzelman Mistakes and Errors Wed, 25 Nov 2009 21:35:26 +0000 http://www.mindat.org/forum.php?read,7,161302,161449#msg-161449 http://www.mindat.org/forum.php?read,7,161302,161449#msg-161449 I corrected the province to Walloon Brabant, and checked if Nil-St Vincent was OK, it wasn't so I changed that one too.
Also I corrected the hierarchy of Quenast, it said: Quenast, Bierghes, Rebecq, Enghien, Brabant etc whereas it should merely read (at least according to the info I have): Quenast, Rebecq, Brabant Wallon etc.....
Thanks for having a keen eye on the Belgian locs, many of them have been uploaded on Mindat by contributors that haven't actually visited the locations or don't have les mineraux de Belgiques at hand ;-)

Salut

Harjo]]> Harjo Neutkens Mistakes and Errors Wed, 25 Nov 2009 20:29:35 +0000 http://www.mindat.org/forum.php?read,7,161440,161440#msg-161440 http://www.mindat.org/forum.php?read,7,161440,161440#msg-161440
This Azurite [www.mindat.org] is listed as from Touissit, but I am sure it is from the Oumjrane Mine, Alnif, Tarhbalt, Morocco.


Regards,
Mario Pauwels]]> Mario Pauwels Mistakes and Errors Wed, 25 Nov 2009 19:01:31 +0000 http://www.mindat.org/forum.php?read,7,158052,161401#msg-161401 http://www.mindat.org/forum.php?read,7,158052,161401#msg-161401 www.mindat.org]
Check this one too, its the same association but the photo quality is far better.

Lefteris]]> Lefteris Rantos Mistakes and Errors Wed, 25 Nov 2009 16:08:58 +0000 http://www.mindat.org/forum.php?read,7,160924,161372#msg-161372 http://www.mindat.org/forum.php?read,7,160924,161372#msg-161372 Nicolas Francfort Mistakes and Errors Wed, 25 Nov 2009 06:06:24 +0000 http://www.mindat.org/forum.php?read,7,161273,161359#msg-161359 http://www.mindat.org/forum.php?read,7,161273,161359#msg-161359 Rock Currier Mistakes and Errors Wed, 25 Nov 2009 04:51:31 +0000 http://www.mindat.org/forum.php?read,7,161207,161358#msg-161358 http://www.mindat.org/forum.php?read,7,161207,161358#msg-161358 Rock Currier Mistakes and Errors Wed, 25 Nov 2009 04:36:56 +0000 http://www.mindat.org/forum.php?read,7,161207,161339#msg-161339 http://www.mindat.org/forum.php?read,7,161207,161339#msg-161339 After reading Kevin's post, I now recall that his information is what I was told by an Aussie friend a few years back.

Bob]]> Robert Knox Mistakes and Errors Tue, 24 Nov 2009 23:22:33 +0000 http://www.mindat.org/forum.php?read,7,161207,161338#msg-161338 http://www.mindat.org/forum.php?read,7,161207,161338#msg-161338 I would say that your locality info is correct, but to my understanding Marra Mamba is name given to the material from only a couple of the mines in that formation. I'm not sure exactly what the difference is in the appearence, I think maybe the green and blue colors found with the red and gold. I know that the mines stopped producing about 20 or so years ago. All the later material is coming from the same formation, but is considered Mount Brockman Tigereye and not Marra Mamba. At least that is my understanding.

For anyone interested, I've included a link about all the specialty "tigereye" from around the world.

[topgems.homestead.com]


Bob Knox]]> Robert Knox Mistakes and Errors Tue, 24 Nov 2009 23:01:55 +0000 http://www.mindat.org/forum.php?read,7,161112,161318#msg-161318 http://www.mindat.org/forum.php?read,7,161112,161318#msg-161318 www.mindat.org]). I have a few more examples of this material if anyone out there has the facilities to idenify it; the Ruff program was unable to do this.]]> William C. van Laer Mistakes and Errors Tue, 24 Nov 2009 21:34:23 +0000 http://www.mindat.org/forum.php?read,7,161302,161311#msg-161311 http://www.mindat.org/forum.php?read,7,161302,161311#msg-161311 Provinces to be fixed.]]> Uwe Kolitsch Mistakes and Errors Tue, 24 Nov 2009 20:45:29 +0000 http://www.mindat.org/forum.php?read,7,161112,161310#msg-161310 http://www.mindat.org/forum.php?read,7,161112,161310#msg-161310
It's bilingual!]]> Uwe Kolitsch Mistakes and Errors Tue, 24 Nov 2009 20:41:31 +0000 http://www.mindat.org/forum.php?read,7,161207,161304#msg-161304 http://www.mindat.org/forum.php?read,7,161207,161304#msg-161304
Thanks for reply. It sounds then that Marra Mamba is not a locality, but a location in a rock formation that runs through the whole area. Correct?

Then possibly the best locality would just be "Hamersley Ranges (Hammersley Ranges), Pilbara Region, Western Australia, Australia?" Or is there a better, more specific one?

Bill]]> William W Besse Mistakes and Errors Tue, 24 Nov 2009 20:25:19 +0000 http://www.mindat.org/forum.php?read,7,161302,161302#msg-161302 http://www.mindat.org/forum.php?read,7,161302,161302#msg-161302
This quarry (now abandoned and filled with water) was in quartzites of the Brabant-massif, not in devonian or Carbon limestone like most quarries in southern Belgium .

Also, the province of Brabant is split (about 20 years ago) in the frenhspeaking province of Brabant Wallon (Waals-Brabant) and the Dutchspeaking province of Vlaams-Brabant (Brabant Flamand). Opprebais is situated in Brabant Wallon)]]> erik vercammen Mistakes and Errors Tue, 24 Nov 2009 20:21:17 +0000 http://www.mindat.org/forum.php?read,7,161112,161301#msg-161301 http://www.mindat.org/forum.php?read,7,161112,161301#msg-161301 Donald Slater Mistakes and Errors Tue, 24 Nov 2009 20:19:01 +0000 http://www.mindat.org/forum.php?read,7,160561,161292#msg-161292 http://www.mindat.org/forum.php?read,7,160561,161292#msg-161292 Uwe Kolitsch Mistakes and Errors Tue, 24 Nov 2009 19:16:35 +0000 http://www.mindat.org/forum.php?read,7,161054,161290#msg-161290 http://www.mindat.org/forum.php?read,7,161054,161290#msg-161290 Uwe Kolitsch Mistakes and Errors Tue, 24 Nov 2009 19:11:00 +0000 http://www.mindat.org/forum.php?read,7,161017,161289#msg-161289 http://www.mindat.org/forum.php?read,7,161017,161289#msg-161289 Uwe Kolitsch Mistakes and Errors Tue, 24 Nov 2009 19:10:10 +0000 http://www.mindat.org/forum.php?read,7,161022,161288#msg-161288 http://www.mindat.org/forum.php?read,7,161022,161288#msg-161288 Karl Volkman Mistakes and Errors Tue, 24 Nov 2009 19:09:43 +0000 http://www.mindat.org/forum.php?read,7,161022,161287#msg-161287 http://www.mindat.org/forum.php?read,7,161022,161287#msg-161287 Uwe Kolitsch Mistakes and Errors Tue, 24 Nov 2009 19:06:28 +0000 http://www.mindat.org/forum.php?read,7,161112,161278#msg-161278 http://www.mindat.org/forum.php?read,7,161112,161278#msg-161278 Alfredo Petrov Mistakes and Errors Tue, 24 Nov 2009 18:41:54 +0000 http://www.mindat.org/forum.php?read,7,161273,161273#msg-161273 http://www.mindat.org/forum.php?read,7,161273,161273#msg-161273 I just returned from a mining trip to the raspberry Grossular locality and would like to correct the locality information on this private ranch location.

Lake Jaco, Chihuahua never was the source of garnets. It was a way to throw off competitors. Some people labeled specimens in confusion with the Xolostoc, Morelos, Mexico, pink garnet location which makes for some very messed up labels. Other labeling errors are Sierra de las Cruces or Sierra de Cruz.

The closest town is Hercules, Coahuila and the area is part of the Municipio de Sierra Mojada, this could be added to the labeling. The article in the Mineralogical Record issue from November -December 2003, volume 34, Number 6 contains great info on the locality.

The proper locality for the raspberry garnets is
Santo Domingo claim
Sierra de Cruces
Coahuila, Mexico

The deep red garnets in wollastonite were mined by Sutton and Griffis in 1994. This hill (cerro) is a few kilometers to the SW of the raspberry location. Two specimens are on the right side of page 77 in the Mineralogical Rec article. This area was mined out and are from the
Cerro de Moka
Sierra de Cruces
Coahuila, Mexico

The pink and green grossular are from locations to the NE of the raspberry location.
Sierra de Cruces
Coahuila, Mexico

Dennis]]> Dennis Beals Mistakes and Errors Tue, 24 Nov 2009 17:55:13 +0000 http://www.mindat.org/forum.php?read,7,161207,161229#msg-161229 http://www.mindat.org/forum.php?read,7,161207,161229#msg-161229
Silicified asbestos ............great

So if you you don't want to handle Riebeckite (the asbestiform) due to its carcinogenic nature try cutting the silicified stuff (Tiger Eye) and get silicosis !!!!

Just being odd today !!!!

But yes there is a lot of the stuff in WA. Hadn't actually heard of Marra Mamba so I learnt something today.

Cheers]]> Keith Compton Mistakes and Errors Tue, 24 Nov 2009 10:22:05 +0000 http://www.mindat.org/forum.php?read,7,161207,161228#msg-161228 http://www.mindat.org/forum.php?read,7,161207,161228#msg-161228 Rock Currier Mistakes and Errors Tue, 24 Nov 2009 10:11:08 +0000 http://www.mindat.org/forum.php?read,7,161100,161221#msg-161221 http://www.mindat.org/forum.php?read,7,161100,161221#msg-161221 Knut]]> Knut Eldjarn Mistakes and Errors Tue, 24 Nov 2009 08:35:58 +0000 http://www.mindat.org/forum.php?read,7,161207,161208#msg-161208 http://www.mindat.org/forum.php?read,7,161207,161208#msg-161208
I believe the Marra Mamba description is exclusive to the Banded Iron Formations of the Pilbara Region of NW Western Australia, and particularly the formations known as the 'Hamersley Group'. The following extracts have been taken from a Riotinto corporation publication:
During the period of formation (of the Hamersley Group), layers of rock with different chemical composition were deposited. Iron-rich layers alternate with silica-rich layers in the rock formation. Occasionally these layers are interspersed with layers of sedimentary rock. This type of rock formation is called a Banded Iron Formation (BIF)
Geologists have identified and named distinct units within the BIF of the Hamersley Group. Commercially, the most important BIF units are the Brockman Iron Formation (620m thick) and the Marra Mamba Iron Formation (230m thick). These layers host many of the large iron ore deposits in the Province. The Marra Mamba Iron Formation is older than the Brockman Iron Formation and is situated below the Brockman unit in the original rock sequence.
Bedded Iron Deposits
Where Banded Iron Formation (BIF) has been enriched by natural processes, these zones can become Bedded Iron Deposits. Many of the commercially important iron ore deposits in the Pilbara were formed by natural enrichment of BIF. These enriched deposits include the commercially viable ores in the Brockman and Marra Mamba Iron Formations.
Marra Mamba Iron Deposits
There are numerous high grade Marra Mamba Iron Deposits. Marra Mamba deposits all have goethite hematite mineralogy.There is also a range of physical properties exhibited within Marra Mamba deposits. Silica and alumina percentages are moderately low. Marra Mamba ores are typically grey-yellow-brown.

This may assist you - and from my uninformed perspective I think the specimens are very good examples of Marra Mamba Tiger's Eye.

Cheers
Keven]]> Keven Semple Mistakes and Errors Tue, 24 Nov 2009 05:07:00 +0000 http://www.mindat.org/forum.php?read,7,161207,161207#msg-161207 http://www.mindat.org/forum.php?read,7,161207,161207#msg-161207
When I went to look up Marra Mamba, I find (http://www.mindat.org/loc-17487.html), but no Tiger's Eye references. Look up Tiger's Eye and I get not reference to Australia. I did find this locality (http://www.mindat.org/loc-17689.html) with a specimen that looks like mine, but no mention of Mara Mamba. Then there is the Tiger Iron locality (http://www.mindat.org/loc-146994.html), which is close, but no cigar and I do not know if it relates.

Sorry if the above Mindat references do not come out correctly. I seem to be having a problem with that tonight.

Can anybody clear this locality question up for me?

Below is a scan of my pieces.

Bill

Marra Mamba Tiger's Eye, tallest ~10cm.	© WWB

]]> William W Besse Mistakes and Errors Tue, 24 Nov 2009 03:04:38 +0000