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Collection of Michael Shaw
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Michael Shaw
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PostPosted: Jul 01, 2013 10:24    Post subject: Re: Collection of Michael Shaw  

More from Peru including my favorite mineral - galena.


1018 Galena.jpg
 Description:
Galena
Pachapaqui District, Bolognesi Province, Ancash Department, Peru
7.4 x 9.4 cm.
Lead gray, cuboctahedral galena crystals associated with pale pink calcite rhombs, cubic pyrite, quartz, and sphalerite.
 Viewed:  25244 Time(s)

1018 Galena.jpg



1647 Tetrahedrite.jpg
 Description:
Tetrahedrite
Mercedes Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru
5.4 x 7.7 cm
Semi-lustrous, sharply formed tetrahedrite crystals to 2.6 cm.
 Viewed:  25253 Time(s)

1647 Tetrahedrite.jpg



1091 Galena.jpg
 Description:
Galena
Huanzala Mine, Huallanca District, Dos de Mayo Prov., Hunauco Dept., Peru
5.3 x 8.5 cm.
Galena associated with colorless, bladed Baryte.
 Viewed:  25225 Time(s)

1091  Galena.jpg



1527 Galena.jpg
 Description:
Galena
Alimon Mine, Huayllay District, Pasco Province, Pasco Department, Peru
5.5 x 7.0 cm.
Metallic silver-gray, spinel-twinned galena crystals associated with black sphalerite.
 Viewed:  25260 Time(s)

1527 Galena.jpg


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PostPosted: Jul 02, 2013 14:58    Post subject: Re: Collection of Michael Shaw  

Still more from Peru.


1040 Siderite.jpg
 Description:
Siderite
Julcani Mine, Julcani District, Angaraes Province, Huancavelica Department, Peru
3.5 x 7.0 cm.
Brownish, flattened siderite rhombs stacked one on top of another and completely covering matrix.
 Viewed:  25204 Time(s)

1040 Siderite.jpg



1986 Fluorite.jpg
 Description:
Fluorite
Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru
5.5 x 7.0 cm.
Pale green octahedral fluorite crystal measuring 4.0 cm on a matrix of cream to tan dolomite and quartz crystals.
 Viewed:  25181 Time(s)

1986 Fluorite.jpg



2024 Alabandite.jpg
 Description:
Alabandite
Uchucchacua Mine, Oyon Province, Lima Dept., Peru
5.1 x 5.6 cm.
Well-formed lustrous black alabandite crystals associated with crystallized pink rhodochrosite.
 Viewed:  25192 Time(s)

2024 Alabandite.jpg



0991 Calcite.jpg
 Description:
Calcite
Morococha District, Yauli Prov., Junin Dept., Peru
4.5 x 6.5 cm.
Sugary-textured, tan scalenohedral calcite crystals, several of which have a secondary growth forming a cap on the original termination.
 Viewed:  25204 Time(s)

0991 Calcite.jpg


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Ru Smith




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PostPosted: Jul 02, 2013 19:51    Post subject: Re: Collection of Michael Shaw  

Very fine specimens and how interesting to have galena as favourite mineral. How did that come about?
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PostPosted: Jul 02, 2013 20:46    Post subject: Re: Collection of Michael Shaw  

Ru Smith wrote:
Very fine specimens and how interesting to have galena as favourite mineral. How did that come about?

Thanks Ru. As for my favorite mineral being galena, one of the first minerals in my collection was a specimen from the Tri-State area of Oklahoma, Kansas, and Missouri. It has a couple of bright cubic galena crystals perched up on a shard of chert. The perfection of those cubes always fascinated me, and the metallic luster was a bonus. I've loved galena ever since.
Michael
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PostPosted: Jul 04, 2013 14:58    Post subject: Re: Collection of Michael Shaw  

Continuing with Peru.


1313 Barite.jpg
 Description:
Baryte
Cerro Warihuyn, Miraflores, Huamalíes Province, Huánuco Department, Peru
3.9 x 6.0 cm.
Transparent, bladed Baryte crystals on pale pinkish-white dolomite. Mined in 2005.
 Viewed:  25104 Time(s)

1313 Barite.jpg



1038 Quartz.jpg
 Description:
Quartz
Cantera Quesga, Ancash Department, Peru
4.9 x 8.0 cm.
Colorless transparent quartz crystals scattered over a matrix of platy, mint green fuschite crystals.
 Viewed:  25080 Time(s)

1038 Quartz.jpg



2012 Quartz var. Japan twin.jpg
 Description:
Quartz
Mundo Nuevo Mine, Huamachuco, La Libertad, Peru
3.3 x 4.5 cm.
Doubly terminated Japan law twin associated with small black hübnerite crystals. Collected in 2011.
 Viewed:  25058 Time(s)

2012 Quartz var. Japan twin.jpg


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PostPosted: Jul 06, 2013 13:54    Post subject: Re: Collection of Michael Shaw  

Today's post will finish Peru. I'll continue to show minerals from South America in my collection in upcoming posts. Up next - Bolivia and Argentina.


1635 Rhodochrosite.jpg
 Description:
Rhodochrosite
Santa Rita Mine, Morococha District, Yauli Province, Junín Department, Peru
5.0 x 7.0 cm.
A druse of lustrous pink hodochrosite crystals interspersed with transparent quartz crystals on a massive rhodochrosite and sulfide matrix.
 Viewed:  25007 Time(s)

1635 Rhodochrosite.jpg



0993 Pyrite.jpg
 Description:
Pyrite
Alimon Mine, Huaron mining district, Huayllay district, Pasco Province, Pasco Department, Peru
8.2 x 10.6 cm.
Typical cubic pyrite crystals with colorless quartz crystals and black sphalerite on a massive sphalerite matrix
 Viewed:  25010 Time(s)

0993 Pyrite.jpg



0992 Tetrahedrite.jpg
 Description:
Tetrahedrite
Pachapaqui District, Bolognesi Province, Ancash Department, Peru
5.8 x 8.7 cm.
Metallic black tetrahedrite crystals with manganoan calcite and quartz on a sulfide matrix.
 Viewed:  25002 Time(s)

0992 Tetrahedrite.jpg



0994 Rhodochrosite (2).jpg
 Description:
Rhodochrosite
Uchucchacua Mine, Oyon Province, Lima Dept., Peru
6.8 x 8.7 cm. FOV = 5.0 cm
Gemmy, cherry red rhodochrosite rhombs with stepped faces associated with colorless cuboctahedral fluorite crystals on a black manganese rich matrix.
 Viewed:  25035 Time(s)

0994 Rhodochrosite (2).jpg


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PostPosted: Jul 08, 2013 11:19    Post subject: Re: Collection of Michael Shaw  

Collection minerals from Bolivia.


0975 Copper ps. aragonite.jpg
 Description:
Copper
Corocoro, Pacajes Province, La Paz Department, Bolivia
2.0 x 3.0 cm.
Sharp pseudomorph of native copper after aragonite.
 Viewed:  24990 Time(s)

0975 Copper ps. aragonite.jpg



0593 Vivianite.jpg
 Description:
Vivianite
Morococala Mine, 280 M Level, Dalence Prov., Oruro Dept., Bolivia
2.5 x 5.0 cm.
Gemmy doubly terminated emerald green vivianite crystals.
 Viewed:  25095 Time(s)

0593 Vivianite.jpg



1663 Cassiterite.jpg
 Description:
Cassiterite
Viloco Mine, Loayza Province, La Paz Dept., Bolivia
4.5 x 8.2 cm.
Lustrous, dark brown, twinned crystals associated with small quartz crystals.
 Viewed:  24958 Time(s)

1663 Cassiterite.jpg


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PostPosted: Jul 08, 2013 15:49    Post subject: Re: Collection of Michael Shaw  

crosstimber wrote:
Copper
Corocoro, Pacajes Province, La Paz Department, Bolivia
2.0 x 3.0 cm.
Sharp pseudomorph of native copper after aragonite.

Very nice specimen thanks to the uncommon sharp edges, and excellent photo as usual.

Just as a curiosity, I'd like to add that some experts in Bolivian minerals, among them our fellow Alfredo Petrov, believe that it is actually copper after calcite after aragonite. And some specimens with superficial oxidation would contain malachite after copper after calcite after aragonite (needing a very large label).
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PostPosted: Jul 08, 2013 21:33    Post subject: Re: Collection of Michael Shaw  

Carles Millan wrote:
crosstimber wrote:
Copper
Corocoro, Pacajes Province, La Paz Department, Bolivia
2.0 x 3.0 cm.
Sharp pseudomorph of native copper after aragonite.

Very nice specimen thanks to the uncommon sharp edges, and excellent photo as usual.

Just as a curiosity, I'd like to add that some experts in Bolivian minerals, among them our fellow Alfredo Petrov, believe that it is actually copper after calcite after aragonite. And some specimens with superficial oxidation would be malachite after copper after calcite after aragonite (needing a very large label).


Thanks Carles, that's an interesting observation. I have had an interest in pseudomorphs for about 15 years and pseudomorphs are the focus of one of my sub-collections. While I think they are endlessly fascinating, I also find some of them confusing. Many are pretty straightforward and it is easy to see what the original mineral was. However, when there is a sequence of multiple pseudomorphs it can get pretty tricky.
Michael
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PostPosted: Jul 09, 2013 03:13    Post subject: Re: Collection of Michael Shaw  

crosstimber wrote:
Many (pseudomorphs) are pretty straightforward and it is easy to see what the original mineral was. However, when there is a sequence of multiple pseudomorphs it can get pretty tricky.

Alfredo told me once that a great deal of copper specimens from that deposit still keep a portion of the original calcium carbonate in the inner part. This material has been analyzed several times and it happens to have calcite crystallographic structure, and not the aragonite's anymore.

Jordi Fabre will forgive me but I'm unable to find that conversation at FMF. If it really exists...
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PostPosted: Jul 09, 2013 04:14    Post subject: Re: Collection of Michael Shaw  

Carles Millan wrote:
...Jordi Fabre will forgive me but I'm unable to find that conversation at FMF. If it really exists...

Here it is: Bolivian copper after aragonite
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PostPosted: Jul 09, 2013 04:44    Post subject: Re: Collection of Michael Shaw  

Hi Michael. Beautiful specimens, especially the Rhodochrosites.
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PostPosted: Jul 09, 2013 15:04    Post subject: Re: Collection of Michael Shaw  

Thanks for your kind comments, Pierre. And thank you to Jordi for supplying the link to the thread on the copper pseudomorphs from Corocoro. I will have to look up Alfredo's article in Rocks and Minerals.

Michael
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PostPosted: Jul 09, 2013 15:26    Post subject: Re: Collection of Michael Shaw  

Amazing pics and specimens.
Roger.
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PostPosted: Jul 09, 2013 22:32    Post subject: Re: Collection of Michael Shaw  

Roger Warin wrote:
Amazing pics and specimens.
Roger.


Thank you Roger.
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PostPosted: Jul 09, 2013 22:45    Post subject: Re: Collection of Michael Shaw  

Roger Warin wrote:
Amazing pics and specimens.
Roger.

Michael,

I totally agree with Pierre and Roger.

Don

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PostPosted: Jul 10, 2013 09:49    Post subject: Re: Collection of Michael Shaw  

Thanks Don. I really look forward to viewing all of the collection threads each day. Each one is a reflection of the tastes and interests of the individual collector, and in the case of Pierre's and Mike Wood's threads, some wonderful photos of where these treasures come from.


0790 Quartz var. ametrine.jpg
 Description:
Quartz
Anahi Mine, La Gaiba District, Sandoval Prov., Santa Cruz Dept., Bolivia
3.2 x 8.0 cm.
Partially etched crystal of amethyst with a gemmy interior and zones of yellow citrine.
 Viewed:  24708 Time(s)

0790 Quartz var. ametrine.jpg



Sulfur (a2) - El Desierto Mine, Bolivia.jpg
 Description:
Sulfur
El Desierto Mine, San Pablo de Napa, Daniel Campos Prov., Potosi Dept., Bolivia
6.4 x 8.4 cm.
Gemmy, complex sulfur crystals on a gray altered volcanic matrix.
 Viewed:  24659 Time(s)

Sulfur (a2) - El Desierto Mine, Bolivia.jpg



Magnetite Cerro Huanaquino.jpg
 Description:
Magnetite
Cerro Huanaquino, Potosi Dept., Bolivia
4.5 x 6.9 cm.
Octahedral magnetite crystals to 1.5 cm.
 Viewed:  24659 Time(s)

Magnetite Cerro Huanaquino.jpg



Pyrite - Canutillos Mine.jpg
 Description:
Pyrite
Canutillos Mine, Machacamarca District, Cornelio Saavedra Prov., Potosí Dept., Bolivia
3.7 x 5.2 cm.
Brassy pyrite crystals with an unusual habit.
 Viewed:  24646 Time(s)

Pyrite - Canutillos Mine.jpg


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PostPosted: Jul 13, 2013 10:04    Post subject: Re: Collection of Michael Shaw  

A few more from Bolivia.


1736 Franckeite (2).jpg
 Description:
Franckeite
Itos Mine, Oruro City, Cercado Province, Oruro Department, Bolivia
6.4 x 7.0 cm.
A rich mass of crystalline franckeite,
 Viewed:  24519 Time(s)

1736 Franckeite (2).jpg



1736 Franckeite.jpg
 Description:
Franckeite
Itos Mine, Oruro City, Cercado Province, Oruro Department, Bolivia
6.4 x 7.0 cm
 Viewed:  24543 Time(s)

1736 Franckeite.jpg



1828 Vauxite.jpg
 Description:
Vauxite
Siglo Veinte Mine, Llallagua, Bustillo Prov., Potosi Dept., Bolivia
4.0 x 5.5 cm.
A crystallized crust of vauxite from the type locality for the species.
 Viewed:  24526 Time(s)

1828 Vauxite.jpg



1717 Paravauxite.jpg
 Description:
Paravauxite
Siglo Veinte Mine, Llallagua, Bustillo Prov., Potosi Dept., Bolivia
6.1 x 9.4 cm.
Sharp pale green paravauxite blades to 1.0 cm from the type locality. Ex. Philadelphia Academy Collection. This specimen was collected by Samuel Gordon during one of the Vaux expeditions to Bolivia.
 Viewed:  24531 Time(s)

1717 Paravauxite.jpg



1414 Wavellite.jpg
 Description:
Wavellite
Siglo Veinte Mine, Llallagua, Bustillo Prov., Potosi Dept., Bolivia
5.1 x 7.0 cm.
Numerous yellowish-white spheres of wavellite covering a thin plate and associated with transparent quartz crystals and micro cassiterite.
 Viewed:  24525 Time(s)

1414 Wavellite.jpg



1809 Cylindrite.jpg
 Description:
Cylindrite
Santa Cruz Mine, Poopó town, Poopó Province, Oruro Department, Bolivia
6.2 x 7.1 cm.
Steel gray crystals of cylindrite showing the tubular habit that gives the species its name. The Santa Cruz Mine is the type locality for this mineral.
 Viewed:  24536 Time(s)

1809 Cylindrite.jpg



1809 Cylindrite closeup.jpg
 Description:
Cylindrite
Santa Cruz Mine, Poopó town, Poopó Province, Oruro Department, Bolivia
6.2 x 7.1 cm. FOV~2.0 cm
 Viewed:  24463 Time(s)

1809 Cylindrite closeup.jpg


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PostPosted: Jul 13, 2013 10:44    Post subject: Re: Collection of Michael Shaw  

Interesting. Long ago that I did not seen a cylindrite.
Roger.
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PostPosted: Jul 13, 2013 14:21    Post subject: Re: Collection of Michael Shaw  

Roger Warin wrote:
Interesting. Long ago that I did not seen a cylindrite.
Roger.


Roger,

Although frankeite and cylindrite are both tin sulfosalts that are apparently pretty common in the district, they are rare throughout the rest of the world. Apparently, there are still quantities of both of these minerals in the mines at Oruro, but as of 2009 there hasn't been any production. According to the Lithographie monograph on Bolivia, the last cylindrite to hit the market was in 1995. I suppose the scarcity on the market is related to the fact that it's occurrence is very restricted, and being a black mineral, it is not that appealing to many collectors.

Michael
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