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Joined: 05 May 2007
Posts: 1536
Location: Catalonia
Posted: Oct 09, 2015 08:31 Post subject: Collection of Carles Millan - Pyrite from Huanzala
Pyrite, calcite, tetrahedrite, sphalerite
Lustrous cube-octahedron {100} {111} combination of pyrite crystals with numerous milky white translucent scalenohedrons of calcite, accompanied with minor sphalerite and a couple of small tetrahedrite tetrahedrons, all over the main crystal, on a matrix of pyrite. Complete all around, a 360° specimen that is displayable from all sides. Overall size: 81 mm x 75 mm x 71 mm. Main pyrite crystal: 41mm wide. Major calcite crystal: 22mm long. Weight: 566 g.
Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru.
Note that Huanzala mine is probably the most prolific deposit of pyrite ever. Collection specimens have been produced there by the millions, but unfortunately most of them with visible damage.
Photos supplied by Rudolf Watzl.
2794D-pyrite2.jpg
Mineral:
Pyrite, Calcite, Tetrahedrite, Sphalerite
Locality:
Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru
Dimensions:
81 mm x 75 mm x 71 mm
Description:
Viewed:
42164 Time(s)
2794D-pyrite1.jpg
Mineral:
Pyrite, Calcite, Tetrahedrite, Sphalerite
Locality:
Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru
Dimensions:
81 mm x 75 mm x 71 mm
Description:
Viewed:
42167 Time(s)
2794X-pyrite1.jpg
Mineral:
Pyrite, Calcite, Tetrahedrite, Sphalerite
Locality:
Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru
Posted: Oct 10, 2015 12:14 Post subject: Re: Collection of Carles Millan
Carles Millan wrote:
To Tobi, James and Don. Thanks a lot for your kind comments. I'm very glad you like the pyrite.
There are from my point of view several reasons to like that specimen:
- It has a nice shape with that large main crystal sitting on the top.
- The matrix is also pyrite, though this may lower the colour contrast, the specimen looks very classy and I guess this are also two generations (?) of pyrite growth which would make this paragenesis even more interesting.
- There are both black and white minerals on it which compensate that there's actually not much contrast.
Conclusion: A very fine and presentable pyrite specimen :)
Joined: 05 May 2007
Posts: 1536
Location: Catalonia
Posted: Oct 10, 2015 12:50 Post subject: Re: Collection of Carles Millan
Tobi wrote:
There are from my point of view several reasons to like that specimen:
- It has a nice shape with that large main crystal sitting on the top.
- The matrix is also pyrite, though this may lower the colour contrast, the specimen looks very classy and I guess this are also two generations (?) of pyrite growth which would make this paragenesis even more interesting.
- There are both black and white minerals on it which compensate that there's actually not much contrast.
Conclusion: A very fine and presentable pyrite specimen :)
Tobi, thanks once again, now for spending your valuable time in such a long and detailed review. I think your analysis is very interesting.
Joined: 05 May 2007
Posts: 1536
Location: Catalonia
Posted: Nov 03, 2015 08:53 Post subject: Collection of Carles Millan - Copper from Kazakhstan
Copper
The specimen consists of a spinel twinned single crystal with a lovely natural deep black oxidation patina, with 3-dimensional complex octahedral {111} sidecar crystals growing off of its length and stacked one on top of another. The crystals show very well defined faces and edges, which is somewhat unusual with this species. I think the dark patina might be tenorite (CuO) rather than cuprite. Field collected in year 2009. Overall size: 63 mm x 10 mm. Major crystal size: 8.5 mm wide. Weight: About 13 g.
Posted: Nov 03, 2015 10:43 Post subject: Re: Collection of Carles Millan
Indeed a very (!) good sample of copper with remarkably well defined crystals, the colour change makes it even more attractive. Usually I don't like native copper specimens, but this one is an eyecatcher, good choice.
Joined: 05 May 2007
Posts: 1536
Location: Catalonia
Posted: Nov 03, 2015 11:05 Post subject: Re: Collection of Carles Millan
Tobi wrote:
Indeed a very (!) good sample of copper with remarkably well defined crystals, the colour change makes it even more attractive. Usually I don't like native copper specimens, but this one is an eyecatcher, good choice.
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