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Cabeça do Cachorro claim
  
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alfredo
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PostPosted: Feb 20, 2022 00:19    Post subject: Cabeça do Cachorro claim  

Do any of our esteemed members know anything about this alleged vivianite and ludlamite locality in the northern Amazon? Some of the material is truly wonderful: https://www.mindat.org/loc-263111.html

The Coordinates given on Mindat are rather vague, and satellite imagery show no significant diggings in the area, just a flat landscape of dense jungle for many km around. Perhaps from some eroded hillsides far to the South? There is no road network in the region, so any rocks taken out would need a long trip in small boats. And even though the material has been on the market for 8 years already, I haven't seen any photos of the locality. It's a bit mysterious.

I'd been wondering whether the material might even have come from a little bit further north, in Venezuela, and then been smuggled into Brazil and rebaptized with a Brazilian name. During periods when Brazil restricted the import of rough stones from abroad, to protect local producers, that kind of "unofficial" import to Brazil, with spurious new Brazilian locality name, was not unheard of. It happened for example with ametrine and optical calcite from Bolivia, which were taken to Brazil and resold on to the USA as "Brazilian" material.

My suspicions were reawakened this month when JTI in Tucson received a big shipment of this vivianite and ludlamite on their characteristic pisolitic limonite matrix, not from Brazil but from a small mineral dealer in Bolivia! How would this material get from the northern Amazon to southwestern Bolivia? There is no highway connection. It would be faster and cheaper to ship from the northern Amazon to Miami than to Bolivia! Why send it to a poor country like Bolivia for onward export to the USA?

Possibly these nicely crystallized phosphates really do come from the area specified on Mindat, but it would be nice to have confirmation, and more info on the locality, and some locality photos. There are some annoying loose ends that don't add up, if you'll pardon my colloquialisms.
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Anísio Cláudio




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PostPosted: Feb 20, 2022 11:41    Post subject: Re: Cabeça do Cachorro claim  

Good morning,

The mine is located in Brazil, in the municipality of São Gabriel da Cachoeira and nearby. We recently received 16 kg of Vivianites and Luddlamites from there. The mining seems to be done in a very artisanal way. The piece in my hands came from there.

Anísio Cláudio



IMG_20220210_103349.jpg
 Mineral: Vivianite
 Locality:
Cabeça do Cachorro claim, São Gabriel da Cachoeira, Cabeça do Cachorro area, Amazonas, Brazil
 Dimensions: 12 x 10 x 8 cm
 Description:
Vivianite and ludlamite
 Viewed:  1781 Time(s)

IMG_20220210_103349.jpg



IMG_20220210_093734.jpg
 Mineral: Ludlamite
 Locality:
Cabeça do Cachorro claim, São Gabriel da Cachoeira, Cabeça do Cachorro area, Amazonas, Brazil
 Dimensions: 30 x 20 x 19 cm
 Description:
Ludlamite geode.
 Viewed:  1780 Time(s)

IMG_20220210_093734.jpg



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Jordi Fabre
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PostPosted: Feb 20, 2022 12:34    Post subject: Re: Cabeça do Cachorro claim  

alfredo wrote:
...Why send it to a poor country like Bolivia for onward export to the USA?...

To avoid some kind of difficulties or legal issues of export of 'rocks' between Brazil and USA that does not happen between Bolivia and USA?
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Anísio Cláudio




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PostPosted: Feb 20, 2022 16:15    Post subject: Re: Cabeça do Cachorro claim  

Here in Brazil, everything is more complicated. The IRS requires codes for export. In the case of exchanging collection samples, there is a specific code. For sale I do not know how it works. Perhaps by issuing a separate invoice.

Aqui no Brasil é tudo mais complicado. A receita federal exige códigos para exportação. No caso de intercâmbio de amostras de coleção, há um código específico. Para venda eu não sei como funciona. Talvez através de emissão de nota fiscal avulsa.

Anísio

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Manuel Mesa




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PostPosted: Feb 21, 2022 03:17    Post subject: Re: Cabeça do Cachorro claim  

Brazilian friends have told me that at the moment it is not known exactly where these phosphates come from. But the name Cabeça do Cachorro (dog's head) is an invented name that refers to the shape of the region in which they come out. In the attached photo you can see how the shape of the region looks like the head of a dog.

Manuel Mesa



amazonas.jpg
 Description:
Cabeça do Cachorro claim
 Viewed:  1638 Time(s)

amazonas.jpg



5246.JPG
 Mineral: Vivianite
 Locality:
São Gabriel da Cachoeira, Cabeça do Cachorro area, Amazonas, Brazil
 Dimensions: 250 x 60 mm
 Description:
 Viewed:  1639 Time(s)

5246.JPG


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Jordi Fabre
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PostPosted: Feb 21, 2022 03:41    Post subject: Re: Cabeça do Cachorro claim  

Manuel Mesa wrote:
...But the name Cabeça do Cachorro (dog's head) is an invented name that refers to the shape of the region in which they come out...

Seems that 'Cabeça do Cachorro' is also used as a name of the area: https://fr.wikipedia.org/wiki/Cabe%C3%A7a_do_Cachorro
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Anísio Cláudio




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PostPosted: Feb 21, 2022 07:34    Post subject: Re: Cabeça do Cachorro claim  

Hi, everybody,

These minerals are very abundant in the region. The hot and humid climate accelerates the lateritization processes.

Anísio

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James Catmur
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PostPosted: Mar 15, 2022 03:51    Post subject: Re: Cabeça do Cachorro claim  

At the mineral show in Madrid last weekend a locality of São Gabriel da Cachoeira was on some specimens
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Anísio Cláudio




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PostPosted: Mar 15, 2022 16:35    Post subject: Re: Cabeça do Cachorro claim  

Greetings. These minerals are removed irregularly, as far as I know.

Anísio

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Firmo Espinar




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PostPosted: Mar 15, 2022 17:57    Post subject: Re: Cabeça do Cachorro claim  

An inspiring example seen in Madrid last weekend.


Vivianite - Cabeça do Cachorro claim_Brazil - 25 cm x 20 cm aproximately.jpg
 Mineral: Vivianite
 Locality:
Cabeça do Cachorro claim, São Gabriel da Cachoeira, Cabeça do Cachorro area, Amazonas, Brazil
 Dimensions: 25 cm x 20 cm aproximately
 Description:
 Viewed:  1189 Time(s)

Vivianite - Cabeça do Cachorro claim_Brazil - 25 cm x 20 cm aproximately.jpg


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alfredo
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PostPosted: Mar 16, 2022 18:51    Post subject: Re: Cabeça do Cachorro claim  

This 40 cm (16 inches) piece was my favorite among the 90 Kg lot I saw. Vivianite from a cavity in pisolitic limonite.


viv.JPG
 Mineral: Vivianite
 Locality:
Cabeça do Cachorro claim, São Gabriel da Cachoeira, Cabeça do Cachorro area, Amazonas, Brazil
 Dimensions: 40 cm
 Description:
 Viewed:  1053 Time(s)

viv.JPG


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Tobi
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PostPosted: Mar 17, 2022 04:53    Post subject: Re: Cabeça do Cachorro claim  

I'm actually not that much into vivianite - but these specimens are incredibly beautiful and impressive!
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